Benzocycloheptenes

ABSTRACT

The subject of the invention is compounds of general formula:    &lt;IMAGE&gt;  I  in which: X represents O or CHR, R1, R2, R3 and R4, which are identical or different, represent a hydrogen atom or a C1-C7 alkyl group, it being possible for R1 to additionally form a bond with R; R5 represents a hydrogen atom, a hydroxyl group or R5, taken together with R7, forms a bond or a&gt;O; group; R6 represents a group of formula:   &lt;IMAGE&gt;   in which R10 and R11, taken together with the carbon atom to which they are attached, form a nitrogenous heterocyclic group, and their N-oxides and pharmaceutically acceptable salts. These compounds are powerful activators of potassium channels.

This is a division of the U.S. application Ser. No. 08/284,454 filed Aug. 5, 1994.

The subject of the present invention is new heterocyclic compounds having a pharmacological activity in the activation of potassium channels.

Activators pf potassium channels or potassium agonists have the property of activating the potassium channels of the cell membrane by opening these channels or prolonging their opening. This results in transmembrane ionic movements and, inter alia, a decrease in free intracellular Ca⁺⁺ ions which causes relaxation of smooth muscle fibres.

This therapeutic potentiality makes it possible today for great hopes to be placed in potassium agonists. Among the most studied fields, arterial hypertension, angina and asthma are the most often mentioned. Large families of activators of potassium channels are already recognized for their relaxant properties.

A family of benzopyran derivatives has formed the subject of many publications in this field.

These compounds correspond to the following general formula A: ##STR3##

EP-0,076,075 describes compounds of general formula A, where ##STR4## represents a pyrrolidone. DE-3,726,261 describes compounds of general formula A, where ##STR5## represents a pyridone.

Another benzopyran family corresponds to the formula B below; it is described in EP-0,298,452: ##STR6##

WO-89/11477 and EP-0,360,131 relate to benzoxepines of general formula C: ##STR7## where X represents a nitrogenous ring connected via the nitrogen atom to the 5-position of the benzoxepines, such as a 2-oxo-1-pyrrolidinyl and 2-oxo-1-pyridyl group for the first and a 2-oxo-1-pyridyl group or a 4-fluoro-benzoylamino group for the second.

R₃, R₄, R₅ and R₆ represent a hydrogen atom or a lower alkyl group and R₁ and R₂ a hydrogen atom or a nitrile, arylsulfonyl or nitro group.

Novel compounds possessing a benzocycloheptene or benzoxepine ring system, which show notable effects on the activation of potassium channels, have now been discovered.

The subject of the invention is compounds of general formula: ##STR8## in which: X represents O, or CHR, R being a hydrogen atom or R, taken together with R₁, forming a bond,

R₁ , R ₂, R₃ and R₄, which are identical or different, represent a hydrogen atom or a C₁ -C₇ alkyl group, it being possible for R₁ to additionally form a bond with R;

R₅ represents a hydrogen atom, a hydroxyl group or R₅, taken together with R₇, forms a bond or a >O; group;

R₆ represents a group of formula: ##STR9## in which R₁₀ and R₁₁, taken together with the carbon atom to which they are attached, form an optionally aromatic mono- or bicyclic nitrogenous heterocyclic group having from 3 to 11 members, including 1 or 2 nitrogen atoms, optionally substituted on the carbon atoms by 1 to 7 groups chosen from hydroxyl, nitro, cyano. C₁ -C₇ alkyl or C₁ -C₇ alkoxy. it being possible for at least one of the nitrogen atoms of the heterocycle to be N-oxidized;

R₇ represents a hydrogen atom or a hydroxyl, C₁ -C₇ alkoxy or C₁ -C₇ acyloxy group or R₅ and R₇ together form a bond or a>O group;

R₈ and R₉, which are identical or different, represent a hydrogen or halogen atom, a hydroxyl, nitro, cyano, trifluoromethyl, trifluoromethoxy, pentafluoroethyl, C₁ -C₇ alkyl, C₁ -C₇ alkoxy, C₁ -C₇ alkylthlo, C₁ -C₇ acylthio, C₁ -C₇ alkylsulfonyl or C₁ -C₇ alkylsulfinyl group, a group of formulae: ##STR10## in which R₁₂ and R₁₃, which are identical or different, represent a hydrogen atom or a C₁ -C₇ alkyl group, or R₈ and R₉ represent a C₆ -C₁₀ aryl, (C₆ -C₁₀)arylsulfonyl or (C₆ -C₁₀)arylsulfinyl group, optionally substituted by one to six substituents chosen from halo, hydroxyl, ni tro, cyano, carboxyl, carbamoyl, trifluoromethyl, trifluoromethoxy, pentafluoroethyl, C₁ -C₇ alkyl, C₁ -C₇ alkoxy, C₁ -C₇ alkylthio, C₁ -C₇ acylthio, C₁ -C₇ alkylsulfonyl or C₁ -C₇ alkylsulfinyl,

or R₈ and R₉, which are identical or different, represent a heterocycle having from 3 to 11 members in the ring including 1 to 4 hetereoatoms, which are identical or different, chosen from O, S and N, optionally substituted by one to six substituents chosen from halo, hydroxyl, nitro, cyano, carboxyl, carbamoyl, trifluoromethyl, trifluoromethoxy, pentafluoroethyl, C₁ -C₇ alkyl, C₁ -C₇ alkoxy, C₁ -C₇ alkylthio, C₁ -C₇ acylthio, C₁ -C₇ alkylsulfonyl or C₁ -C₇ alkyl sulfinyl,

or R₈ and R₉ together form a group (CH₂)_(n), n being a number from 1 to 6, or R₈ and R₉ together form a heterocycle having from 3 to 11 members including 1 to 4 heteroatoms, which are identical or different, chosen from O, S and N, optionally substituted by one to six substituents chosen from halo, hydroxyl, nitro, cyano, carboxyl, carbamoyl, trifluoromethyl, trifluoromethoxy, pentafluoroethyl, C₁ -C₇ alkyl, C₁ -C₇ alkoxy, C₁ -C₇ alkylthio, C₁ -C₇ acylthio, C₁ -C₇ alkylsulfonyl or C₁ -C₇ alkylsulfinyl, and their N-oxides and their pharmaceutically acceptable salts.

"C₁ -C₇ alkyl group" means the groups containing a linear or branched C₁ -C₇ chain, especially the methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, isobutyl, pentyl, hexyl and heptyl groups.

"C₁ -C₇ alkoxy group" means the groups containing a linear or branched C₁ -C₇ chain, especially the methoxy, ethoxy, propoxy, butoxy, pentoxy, hexyloxy and heptyloxy groups.

"C₁ -C₇ acyloxy group" means the alkyl groups containing a linear or branched C₁ -C₆ chain linked to a carbonyloxy functional group, especially the acetoxy and propionyloxy groups.

"C₁ -C₇ alkylthio group" means the alkyl groups containing a linear or branched C₁ -C₇ chain linked to a sulfur atom, especially the methylthio, ethylthio, propylthio, butylthio, pentylthio, hexylthio and heptylthio groups.

"C₁ -C₇ alkylsulfonyl group" means the alkyl groups containing a linear or branched C₁ -C₇ chain linked to a --SO₂ -- sulfonyl group, especially the methylsulfonyl, ethylsulfonyl, propylsulfonyl, butylsulfonyl, pentylsulfonyl, hexylsulfonyl and heptylsulfonyl groups.

"C₁ -C₇ alkylsulfinyl group" means the alkyl groups containing a linear or branched C₁ -C₇ chain linked to a --SO-- sulfinyl group, especially the methylsulfinyl, ethylsulfinyl, propylsulfinyl, butylsulfinyl, pentylsulfinyl, hexylsulfinyl and heptylsulfinyl groups.

"C₆ -C₁₀ aryl group" means the mono- or bicyclic carbocyclic aromatic groups, especially the phenyl, naphthyl or indenyl groups.

The term "halogen" means the fluorine, chlorine, bromine or iodine atoms.

The heterocycle containing from 3 to 11 atoms, including 1 to 4 hetereoatoms chosen from O, S and N, can be aromatic or nonaromatic, monocyclic or bicyclic, and is in particular a pyridyl, imidazolyl, furyl, tetrahydrofuryl, furazanyl, thienyl, aziridinyl, oxiranyl, azetidinyl, quinolyl, tetrahydroquinolyl and tetrazolyl group.

When R₈ and R₉ together form a heterocycle having from 3 to 11 members, including 1 to 4 identical or different hetereoatoms chosen from O, S and N, they represent, especially with the phenyl group to which they are, attached, a quinolyl, isoquinolyl, benzimidazolyl, benzofuryl, benzothienyl and benzoxadiazolyl group.

The R₆ group is in particular a 2-pyridyl, 2-pyridyl N-oxide, 3-pyridyl, 3-pyridyl N-oxide, 4-pyridyl, 3-hydroxy-4-pyridyl, 2-pyrimidyl, 2-pyrimidyl N-oxide, 6-pyrimidyl, 6-pyrimidyl N-oxide, 2-quinolyl, 2-quinolyl N-oxide, 1-isoquinolyl and 1-isoquinolyl N-oxide group, optionally substituted on the carbon atoms by 1 to 3 substituents chosen from hydroxyl, nitro, cyano, C₁ -C₇ alkyl and C₁ -C₇ alkoxy.

The physiologically acceptable salts of the compounds of formula I comprise the salts formed with metals such as sodium, potassium, calcium and magnesium or salts of organic acids such as oxalic, fumaric, maleic, citric, methanesulfonic and lactic acids.

The N-oxides of formula I are the compounds in which 1 or more of the nitrogen atoms of the R₆ group are oxidized.

The term "trans" used for the compounds which carry asymmetric carbon atoms in the rings shows that two substituents are found on either side of a central plane of the ring, and the term "cis" is applied for two substituents which are found on the same side of the same central plane of the ring.

The preferred compounds of general formula I are those in which X represents an oxygen atom.

Advantageously, R₁ and R₂ represent a hydrogen atom and/or R₅ represents a hydrogen atom.

Advantageously, R₇ is chosen from a hydrogen atom or the hydroxyl, methoxy and acetoxy group.

A first preferred family of compounds of the present invention correspond to the compounds of general formula II: ##STR11## in which X represents O or CH--R, and R, R₅, R₆, R₇, R₈ and R₉ are as defined above.

Carbon atoms 4 and 5 of the formula II can together or independently represent a chiral centre. Derivatives such as optical isomers, racemates, cis or trans derivatives, enantiomers and diastereoisomers form part of the invention.

Among the preferred compounds of formula II, it is possible in particular to mention the following compounds:

3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol;

7-fluoro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro -1-benzoxepin-5-ol;

7-bromo-3,3 -dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro 1-benzoxepin-5-ol;

8-bromo-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro -1-benzoxepin-5-ol;

7-bromo-3,3-dimethyl-5-(3-pyridyl N-oxide)-2,3,4,5-tetrahydro 1-benzoxepin-5-ol;

5-acetyloxy-7-bromo-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro -1-benzoxepine;

7-bromo-4,5-epoxy-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepine;

7-bromo-5-methoxy-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3,4,5-tetrahydro-1-benzoxepine;

7- ethyl-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro -1-benzoxepin-5-ol;

7-methoxy-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol;

3,3-dimethyl-7-(1-methylpropyl)-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol;

3,3 -dimethyl-5-(2-pyridyl N-oxide)-7-trifluoromethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-ol;

3,3 -dimethyl-5-(2-pyridyl N-oxide)-7-trifluoromethoxy -2,3,4,5-tetrahydro-1-benzoxepin-5-ol;

3-dimethyl-7-phenyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol;

8-chloro-7-fluoro-3,3-dimethyl-5-(2-pyridyl N-oxide) 2,3,4,5-tetrahydro-1-benzoxepin-5-ol;

3-dimethyl-5-(3-pyridyl N-oxide)-7-trifluoromethyl -2,3,4,5-tetrahydro-l-benzoxepin-5-ol;

8-dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide) 2,3,4,5-tetrahydro-1-benzoxepin-5-ol;

6,8-dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3,4,5-tetrahydro-1-benzoxepin-5-ol;

7,8-dichloro-3,3-dimethyl-5-(3-pyridyl N-oxide) -2,3,4,5-tetrahydro-1-benzoxepin-5-ol;

7,8-dimethoxy-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3,4,5-tetrahydro-1-benzoxepin-5-ol;

7,9-dichloro-3,3-dimethyl-5-(2-pyrldyl N-oxide) -2,3,4,5-tetrahydro-1-benzoxepin-5-ol.

A second preferred family of compounds of the present invention correspond to the compounds of general formula III: ##STR12## in which X represents O or

CH--R, and R, R₆, R₈ and R₉ are as defined above.

Among the preferred compounds of formula III, it is possible in particular to mention the following compounds:

3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine;

7-fluoro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine;

7-bromo-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine;

7-chloro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydrobenzoxepine;

8-bromo-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine;

7,8-bromo-3,3-dimethyl-5-(3-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine;

3,3,7-trimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine;

7-ethyl-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine;

3,3 -dimethyl-7-(1-methylpropyl)-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

7-isopropyl-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

7-methoxy-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro1-benzoxepine;

3,3-dimethyl-5-(2-pyridyl N-oxide)-7-trifluoromethyl -2,3-dihydro-1-benzoxepine;

3,3-dimethyl-5-(2-pyridyl N-oxide)-8-trifluoromethyl -2,3- dihydro-1-benzoxepine;

3,3-dimethyl-5-(2-pyridyl N-oxide)-7-trifluoromethoxy -2,3-dihydro-1-benzoxepine;

3,3-dimethyl-7-methylsulfinyl-5-(2-pyridyl)-2,3-dihydro1-benzoxepine;

3,3-dimethyl-7-methylsulfonyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine;

3,3-dimethyl-7-methylsulfonyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

8-cyano-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydrobenzoxepine;

7-cyano-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine;

3,3-dimethyl-5-(2-pyridyl N-oxide)-7-pentafluoroethyl-2,3-dihydro-1-benzoxepine; 3,3-dimethyl-7-phenyl-5-(2-pyridyl N-oxide)-2,3-dihydro -1-benzoxepine;

3,3-dimethyl-7-nitro-5-(4-nitro-2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

7,8-dichloro-3,3-dimethyl-5-(3-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

6,8-dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

7,9-dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

8,9-dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3dihydro-1-benzoxepine;

7,8-dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

7,8-difluoro-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

9-ethyl-7-fluoro-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

8-cyano-3,3,7-trimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

7-cyano-3,3,8-trimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

7,8 -dimethoxy-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

8-chloro-7-fluoro-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,7,8,9,10-hexa-hydro -1-naphth [2,3-b]oxepine;

8-cyano-3,3-dimethyl-1-(2-pyridyl N-oxide)-4,5-dihydro -H-benzo [4,3-f]cycloheptene;

3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine; -7-carboxamide;

3,3-dimethyl-7-phenylsulfonyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine;

7-chloro-8-ethyl-3,3-dimethyl-5-(2-pyridyl N-oxide ) -2,3-dihydro-1-benzoxepine;

8-bromo-3,3-dimethyl-1-(2-pyridyl N-oxide)-3H-benzo [f]-cyclohepta-1,4-diene.

The compounds of the invention can be prepared by a process comprising:

a) the reaction of a ketone of general formula IV: ##STR13## in which X, R₁, R₂, R₃ and R₄ are as defined above, and R₅ ', R₈ ' and R₉ ' respectively represent the optionally protected R₅, R₈ and R₉ groups as defined above, with an organometallic compound of general formula:

    R.sub.6 '-R.sub.M                                          V

in which R₆ ' represents a group of formula: ##STR14## in which R₁₀ and R₁₁, taken together with the carbon atom to which they are attached, form an optionally aromatic, mono- or bicyclic nitrogenous heterocyclic group having from 3 to ,11 members, including 1 or 2 nitrogen atoms, and optionally substituted on the carbon atoms by 1 to 7 groups, optionally protected if necessary, chosen from hydroxyl, nitro, cyano, C₁ -C₇ alkyl or C₁ -C₇ alkoxy; and

b) the deprotection of protected groups to produce a compound of general formula VI: ##STR15## in which X, R₁, R₂, R₃, R₄, R₅, and R₆, and R₈ and R₉ are as defined above; and optionally

either

c1) the reaction of the compound of general formula VI thus obtained with a reactant of general formula VII:

    R.sub.14 -Y                                                VII

in which R₁₄ represents a C₁ -C₇ alkyl or C₁ -C₇ acyl group and Y represents a leaving group, to produce a compound of general formula I in which R₇ represents a C₁ -C₇ alkoxy or C₁ -C₇ acyloxy group, respectively; or

c2) the dehydration of the compound of general formula VI obtained in b) in the presence of an acid or of an acid chloride to produce a compound of following general formula I: ##STR16## in which X, R₁, R₂, R₃, R₄, R₅, R₆, R₈ and R₉ are as defined above; and optionally

d) the reaction of the compound of formula I obtained in Stage c2) with a peroxide to produce a compound of general formula I in which R₅ and R₇ together form a O group; and optionally

e) the reaction of the compound of general formula VI obtained in Stage b) or of the compound of general formula I obtained in Stage c1), c2) or d) with an oxidizing agent to form a corresponding N-oxide compound; and/or optionally

f) the reaction of the compound of general formula VI obtained in Stage b) or of the compound of general formula I obtained in Stage c1), c2) or d) with a pharmaceutically acceptable inorganic or organic acid to form a corresponding salt.

In the reaction of Stage a), a compound of formula IV as defined above is advantageously reacted with an organolithiumcompound of formula LiR'₆, R'₆ being as defined above.

The compounds of formula LiR'₆ can be prepared in a known way by a person skilled in the art, for example by reacting a compound of the formula R'₆ Br, R'₆ being as defined above, with n-butyllithium in an organic solvent such as diethyl ether or tetrahydrofuran, optionally in the presence of hexamethylphosphoramide or of 1,3-dimethylimidazolidone at a temperature between -110° C. and the reflux temperature of the solvent, or of the mixture of solvents, for a time between 4 hours and 24 hours.

When the compounds of formula IV or V comprise OH groups, the latter are protected by a protective group of the hydroxyl functional group known to a person skilled in the art, for example an SiMe₃ or SiMe₃ tBu group.

The reaction of Stage a) takes place in an inert organic solvent, in particular diethyl ether, THF or hexane, at a temperature between -78° C. and -20° C., followed by the addition of a dilute acid to release the alcohol from the lithium alkoxide complex formed.

The deprotection reaction of Stage b) is carried out by an acid treatment in aqueous medium or by the use of fluoride (for example of tetrabutylammonium fluoride) in tetrahydrofuran at a temperature between -20° C. and 100° C., preferably 25° C.

In Stage c1), the leaving group Y is in particular a halogen atom or an alkyl- or arylsulfonyloxy group, in particular a mesyloxy or tosyloxy group.

Preferably, an acyl halide or an alkyl halide is used in the presence of a Lewis base in a solvent such as dimethylformamide.

The reaction for the removal of H₂ O in Stage c2) is advantageously carried out in acid medium and in the presence of an organic solvent, such as benzene, toluene or xylene, the acid being in particular para-toluene-sulfonic acid or sulfuric acid.

The acid can also consist of an acid chloride such as the chloride of methanesulfonic acid, in the presence of a solvent such as chloroform, dichloromethane or dichloroethane.

The reaction is advantageously carried out at the reflux temperature of the solvent.

The reaction of Stage d) takes place in the presence of a peroxide, in particular a peracid, such as peracetic acid, perbenzoic acid, perphthalic acid or 3-chloroperbenzoic acid. The amount of peroxide used can vary from 1 to 4 equivalents depending on the compound to be oxidized. The solvent used is preferably water, acetic acid or chlorinated solvents such as dichloromethane, chloroform or dichloroethane. The temperature of the reaction is advantageously between -20° C. and the reflux temperature of the solvent.

The reaction of Stage e) takes place in the presence of an oxidizing agent, in particular a peracid such as mentioned above (for example 3-chloroperbenzoic acid) in a solvent such as dichloromethane.

The ketones prepared are in particular:

7-bromo-3,3-dimethyl-2,3,4,5 -tetrahydro-1-benzoxepin-one B.p..sub.(53.2 Pa=0.4 mm Hg) =117°-121° C.

7-chloro-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one B.p..sub.(66.5 Pa=0.5 mm Hg) =80°-100° C.

7-cyano-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one M.p.=114° C.

7-ethyl-3,3-dimethyl-2,3,4,5- tetrahydro-1-benzoxepin-5-one B.p. .sub.(39.9 Pa=0.3 mm Hg) 97°-104° C.

7-fluoro-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one B.p..sub.(53.2 Pa=0.4 mm Hg) =102°-108° C.

7-isopropyl-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one B.p..sub.(53.2 Pa=0.4 mm Hg) =112°-122° C.

7-methoxy-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-3-one B.p..sub.(33.25 Pa=0.25 mm Hg) =122°-126° C.

3,3-dimethyl- 2,3,4,5- tetrahydro-1-benzoxepin-5-one B.p. .sub.(103.4 Pa=0.8 mm Hg) =90° C.

3,3,7 -trimethyl-2,3,4,5- tetrahydro-1-benzoxepin-5-one B.P..sub.(53.2 Pa=0.4 mm Hg) =90°-104° C.

7-(1-methylpropyl)-3,3 -dimethyl-2,3,4,5-tetrahydro -1-benzoxepin-5-one B.p..sub.(53.2 Pa=0.4 mm Hg) =115°120° C.

7-methylthio-3,3 -dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one B.p..sub.(79.8 Pa=0.6 mm Hg) =125°135° C.

7-pentafluoroethyl-3,3-dimethyl- 2,3,4,5 -tetrahydro -1-benzoxepin-5-one

7-phenyl-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one B.p..sub.(26.6 Pa=0.2 mm Hg) =135°-140° C.

7-phenylthio -3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one

7-trifluoromethoxy-3,3-dimethyl-2,3,4,5-tetrahydro 1-benzoxepin-5-one B.p..sub.(2128 Pa=16 mm Hg) =135°-138° C.

7-trifluoromethyl-3,3-dimethyl-2,3,4,5-tetrahydro -1-benzoxepin-5-one B.p..sub.(133 Pa=1 mm Hg) =80°-100° C.

8-bromo-3,3-dimethyl-2,3,4,5-tetrahydro-1H-benzo[f]cyclo hepten-1-one M.p.=94° C.

8-bromo-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin -5-one B.p..sub.(39.9 Pa=0.3 mm Hg) =108°-112° C.

8-trifluoromethyl-3,3-dimethyl-2,3,4,-tetrahydro 1-benzoxepin-5-one B.p..sub.(39.9 Pa =0.3 mm Hg) =85°-110° C.

9-bromo-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin -5-one M.p.=86° C.

7-(2-methylpropyl)-3,3-dimethyl-2,3,4,5-tetrahydro -1-benzoxepin-5-one B.p..sub.(53.2 Pa=0.4 mm Hg) =128°-138° C.

7-(2-methylpropyl)-3,3-dimethyl-2,3,4,5-tetrahydro -1-benzoxepin-5-one B.p.=128°-136° C.

7-bromo -8-methyl-3,3-dimethyl-2,3,4,5-tetrahydro -1-benzoxepin-5-one B.p.-.sub.(53.2 Pa=0.4 mm Hg) =120°-130° C.

6,8 -dichloro-3,3-dlmethyl-2,3,4,5-tetrahydro-1-benzoxe -pin-5-one B.p..sub.(106.4 Pa=0.8 mm Hg) =120° C.

7,8-dichloro-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxe- pin-5-one M.p.=94° C.

7,9 -dichloro-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxe -pin-5-one B.p..sub.(79.8 Pa=0.6 mm Hg) =120°-130° C. 8,9-dichloro-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxe -pin-5-one

7-chloro-8-ethyl-3,3-dimethyl-2,3,4,5-tetrahydro -1-benzoxepin-5-one B.p..sub.(53.2 Pa=0.4 mm Hg) =108°-112° C.

7-chloro-3,3,8-trimethyl-2,3,4,5-tetrahydro -1-benzoxepin-5-one B.p..sub.(53.2 Pa=0.4 mm Hg) =115°-122° C.

7,8-difluoro-3,3-dimethyl -2,3,4,5-tetrahydro-1-benzoxepin -5-one M.p.=84° C.

7-fluoro-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one B.p. M.p. =82° C.

7-fluoro-9-ethyl-3,3-dimethyl-2,3,4,5-tetrahydro -1-benzoxepin-5-one B.p..sub.(79.8 Pa=0.6 mm Hg) =102°-106° C.

7,8-dimethoxy-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin -5-one M.p.=110° C.

7-methyl-8-bromo-3,3-dimethyl-2,3,4,5-tetrahydro -1-benzoxepin-5-one B.p..sub.(66.5 Pa=0.5 mm Hg)= 125°-130° C.

7,8-dichloro-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin -5-one M.p.=95° C.

3,3-dimethyl-2,3,4,5,7,8,9,10-octahydro-l-naphth[2,3-b]-oxepin-5-one B.p..sub.(53.2 Pa=0.4 mm Hg) =135°-150° C.

7-(2-methylpropyl)-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one B.p.=128°-136° C.;

8-chloro-3,3-dimethyl-7-trifluoromethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one M.p.=80° C.;

7-bromo-8-chloro-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one M.p.=94° C.;

3,3-dimethyl-8-phenylthio-2,3,4,5-tetrahydro-1H-benzo[f]cycloheptane -1-one;

7,8-dichloro-3,3-dimethyl-2,3,4,5-tetrahydro-1H-benzo[f]cycloheptane -1-one M.p.=74°.

8-bromo-4,4-dimethyl-2,3,4,5-tetrahydro-1H-benzo[f]cycloheptane-1-one;

8-bromo-3,3-dimethyl-2,3,4,5-tetrahydro-1H-benzo[f]cycloheptane-1-one M.p.=94° C.

The ketones of formula IV can be obtained by cyclization of the acids of formula VIII: ##STR17## in which x, R₁, R₂, R₃, R₄, R₅, R₈ and R₉ are as defined above, according to the method described by Guy Fontaine (Annalen der Chemic, 1968, Volume 3, No. 3, page 180) for the preparation of benzoxepines by cyclization of phenoxybutyric acids in the presence of phosphoric acid, alone or as a mixture with an organic solvent such as xylene, toluene or benzene, or by a Friedel-Crafts reaction from aluminiumchloride and the chlorides of the corresponding 4-phenoxybutanoic, 4-phenylthiobutanoic or 5-phenylpentanoic acids in a solvent such as CS₂ or nitrobenzene.

Other synthetic routes can also be used, in particular the Dieckmann condensation reactions.

The acids of general formula VIII can be prepared when X represents O by reaction of a compound of general formula IX: ##STR18## in which R₈ and R₉ are as defined above, with a compound of general formula X: ##STR19## in which R₁, R₂, R₃, R₄ and R₅ are as defined above, according to the method of Reppe W. (Annalen der Chemie, 1955, book 596, p. 158-224).

The reaction takes place by heating in butanol in the presence of NaOH.

The acids of general formula VIII can also be prepared by reacting a phenol of formula IX as defined above with a compound of general formula XI: ##STR20## in which R₁, R₂, R₃, R₄ and R₅ are as defined above, A represents a halogen atom and B a lower alkyl or phenyl group, in a solvent such as DMF and in the presence of K₂ CO₃ or in acetone in the presence of K₂ CO₃ and KI.

When X represents CHR, the acids of general formula VIII can be prepared according to Mathut K. C. and Singh V. P. (Proc. Natl. Acad. Sci. India. Sect A, 1981, 51 (2), p. 177 and 180), or according to Klaus Michael and Mohr Peter (EP-0,315,071) by:

a) reaction of a compound of formula XII: ##STR21## with a compound of formula XIII or XIV: ##STR22## in which R₁, R₂, R₃, R₄ and R₅ are as defined above, A represents a halogen atom and B a lower alkyl or phenyl group, in the presence of AlCl₃ in a solvent like CS₂ or nitrobenzene, or in the absence of solvent, to produce a compound of general formula XV: ##STR23## in which R₁, R₂, R₃, R₄ and R₅, R₆, R₉ and B are as defined above;

b) hydrolysis of the compound of general formula XV thus obtained

either in basic medium such as NaOH, KOH, NaHCO₃, for example in water/alcohol medium,

or in acid medium:

to produce a compound of general formula XVI: ##STR24## in which R₁, R₂, R₃, R₄, R₅, R₈ and R₉ are as defined above, and

c) reduction of the carbonyl functional group of the compound of formula XVI according to the Wolff-Kishner reaction in the presence of an excess of hydrazine and of strong base, for example potassium hydroxide, in diethylene glycol or polyethylene glycol at high temperature.

The acids of formula VIII prepared are in particular:

4 -phenoxy-3,3-dimethylbutanoic acid, B.p..sub.(13.3 Pa=0.1 mm Hg) =130° C.;

4-(4-bromophenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =154°162° C.;

4-(4-chlorophenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =130°-145° C.;

4-(4-fluorophenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =128°-134° C.;

4-(4-methylphenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =130°-136° C.;

4(4-ethylphenoxy)-3,3-dimethylbutanoic acid, B.p. .sub.(53.2 Pa=0.4 mm Hg) =132°136° C.;

4-(4-isopropylphenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =130°-142° C.;

4- [4-(1-methylpropyl) phenoxy]-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =155°-165° C.;

4-(4-methoxyphenoxy)-3,3-dimethylbutanoic acid, M.p.=69° C.

4-(4-trifluoromethoxyphenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =100°-120° C.;

4-(4-methylthiophenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(106.4 Pa. =0.8 mm Hg) =150°170° C.;

4-(4-phenylphenoxy)-3,3-dimethylbutanoic acid, M.p.=124° C.

4-(3-bromophenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(106.4 Pa=0.4 mm Hg) =140°-160 ° C.;

4- (3,5-dichlorophenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =130°-150° C.;

4-(3,4-dichlorophenoxy)-3,3-dimethylbutanoic acid, M.p.=66° C.;

4-(2,4-dichlorophenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(66.5 Pa=0.5 mm Hg) =150°-160° C.;

4-(2,3-dichlorophenoxy) -3,3-dimethylbutanoic acid, B.p..sub.(66.5 Pa=0.5 mm Hg) =130°-160° C.;

4- (3,4-difluorophenoxy) -3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =110°134° C.;

4-(3-chloro-4-fluorophenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =130°145° C.;

4-(2-ethyl-4-fluorophenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =123°-126° C.;

4-(3,4-dimethoxyphenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =150°-170° C.;

4-(4-bromo-3-methylphenoxy)-3,3-dimethylbutanoic acid, B.p.₅₃.2 Pa=0.4 mm Hg) =130°-135° C.;

4-(3-bromo-4-methylphenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =155°-160° C.;

4-(5,6,7,8-tetrahydro-2-naphthyloxy)-3,3-dimethylbutanoic acid, M.p.=85° C.;

4-[4-(2-methylpropyl)phenoxy]-3,3-dimethylbutanoic acid,

4-B.p..sub.(66.5 Pa=0.4 mm Hg) =160°-180° C.; (4-chloro-3-ethylphenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg)=160°-166° C.;

4-(4-chloro-3-methylphenoxy)-3,3-dimethylbutanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =150°-158° C.;

4-(4-bromo-3-chlorophenoxy)-3,3-dimethyl-butanoic acid, B.p..sub.(53.2 Pa=0.4 mm Hg) =150°170° C.;

5-(4-bromophenyl)-3,3-dimethylpentanoic acid, M.p.=72° C.; 5-(3,4-dichlorophenyl)-3,3-dimethylpentanoic acid;

5-(4-bromophenyl)-4,4-dimethylpentanoic acid, M.p.=106°-108° C.

The compounds of the invention have excellent properties in the activation of potassium channels and have a powerful relaxant effect on smooth musculature. Consequently, they can be used as bronchodilators in disorders of the respiratory system, and in particular against asthma and obstruction of the upper airways. They also have an advantage in the control of hypertension and in the case of disorders of the contraction of the smooth musculature of the gastrointestinal tract, of the uterus, of the urinary tract, and in incontinence phenomena. They are useful in the case of cardiovascular disorders other than hypertension, in particular cardiac insufficiency, angina pectoris, cerebral and peripheral vascular pathologies and pulmonary hypertension. These compounds are additionally active in the treatment of alopecia.

The "potassium channel activating" activity was measured by the rate of exit of rubidium-86 from tracheal smooth muscle cell according to the method described by Allen, S. L., Br. J. Pharmac., 1986, 87, p. 117-127 and 89, p. 395-405.

Rate of the efflux of rubidium-86 in in vitro guinea pig trachea:

Male guinea pigs weighing 250 to 600 g are stunned and exsanguinated by sectioning the jugular. The trachea is rapidly freed and cleaned in situ. The parts removed are placed on hold in an oxygenated modified Krebs-Henseleit (M.K.H.) solution. When all the tracheas are removed each is enriched in smooth muscle. The trachea is placed in a crystallizing dish containing the M.K.H. and a stream of O₂ /CO₂ at 37° C. Two longitudinal incisions are carefully made on both sides of the muscle strip at 1 mm from the latter. The tracheae are then equilibrated in a beaker containing 30 ml of M.K.H. for 30 minutes, after which the rubidium-86 radioactive charge is added. A constant and sustained gaseous flow rate is maintained throughout the manipulation.

The beaker is then replaced by another containing 25 ml of oxygenated M.K.H. and 125 microcuries of ⁸⁶ Rb for 3 hours. The tracheas are washed twice in succession in a beaker containing approximately 100 ml of M.K.H. for 3 minutes.

The tracheae are introduced individually into a series of 10 ml disposable tubes. The latter are filled, 30 seconds before immersion of the tracheae, with 4 ml of oxygenated M.K.H. There are then carried out an immersion of the tracheae for 5 minutes and 5 rinsings of 10 minutes and then efflux periods of 3 minutes. A first group of tubes are used for estimating the base efflux: they contain 10 μl of pure DMSO plus 4 ml of M.K.H. A second group of tubes makes it possible to bring the sample into contact with a concentration of product to be tested lasting seven periods of 3 minutes. The products are used in the form of mother solutions containing 40.1 mmol of pure DMSO, then diluted in the same solvent and introduced in the set amount of 10 μl per 4 ml of M.K.H. The counting is carried out by the Cerenkov effect.

The effective concentration of the product which increases the base efflux rate by 25% (EC_(25%)) is determined.

The efflux rate of the tracer is expressed as percentage of release per minute with respect to the total amount of tracer at the time under consideration.

The EC_(25%) is calculated by linear regression from the relationship: Maximum efflux in the presence of product with respect to the base efflux as a function of the logarithm of the concentration.

The results obtained with representative pounds of the invention are reported in Table I below.

                  TABLE I     ______________________________________     Results of the activating activity of the compounds of     the invention for potassium channels                   Efflux of .sup.86 Rb     Compound      EC.sub.25% (μmol)     ______________________________________      91           1.1     100           2.0     104           0.7     109           1.8     111           0.8     ______________________________________

The bronchodilating activity was measured in vivo by the method of Konzett H. and Rossler R. (Arch. Exp. Pathol. Pharmak., 1940, 195, p. 71 to 74) and Duhault J. et al. (Arzneim. Forsch./Drug. res., 1987, 37, p. 1353 to 1362).

Measurement of the bronchodilating activity:

Dukin-Hartley guinea pigs (400-500 g) are prepared according to the methodology described by Konzett and Rossler. The animals are anaesthetized by an intraperitoneal injection of urethane (1.5 g/kg) and a tracheotomy is prepared for artificial respiration (45 cycles/min; respiratory volume 10 ml/kg).

The animal is connected to a respiratory pump, which is adjusted to deliver a volume of 1 ml per 100 g of body weight of the guinea pig. It is connected to a recorder via a pressure sensor.

A catheter is placed in the jugular for the I.V. injections.

An I.V. injection of gallamine and propanolol is carried out. After stabilizing the pulmonary pressure for 30 minutes, an I.V. injection of histamine is carried out every 10 minutes until reproducibility is achieved; at that point, the test product is injected 10 minutes after the last spasm. Histaxnine is tested 5 minutes and 15 minutes after the injection of the product and the effective dose for a 50 % inhibition is calculated.

The results obtained with representative compounds of the invention are reported in Table II below.

                  TABLE II     ______________________________________     Results of the bronchodilating activity     of the compounds of the invention                  Bronchospam ED.sub.50 mg/kg     Compound       at 5 min at 15 min     ______________________________________      91            0.100    --     100            0.069    0.101     104            0.038    0.210     109            0.086    0.331     111            0.049    0.100     114            0.040    0.300     118            0.150    0.200     119            0.310    0.530     ______________________________________

The compounds of the invention are active in man and animals, in particular in mammals, in particular in dogs, guinea pigs, rabbits, rats and mice.

The compounds of the invention are non-toxic.

Another subject of the invention is a pharmaceutical composition comprising, as active ingredient, a compound according to the invention as defined above, in combination with a pharmaceutically acceptable vehicle.

These pharmaceutical compositions are used in oral, intravenous, intraarterial, cutaneous or intestinal administration or as an aerosol. Moreover, these new products have a long-lasting action, whatever the mode of administration.

The products of the general formula I will be combined in the pharmaceutical form with excipients, flavours and dyes, which are suitable for forming, for example, tablets, which can additionally be provided in the liposomal, microcapsule or nanocapsule form, or in the form of coated tablets, gelatin capsules, solutions, injectable solutions, suppositories, aerosols or creams. The excipients used can be, for example, microcrystalline cellulose, lactose, polyvidone, starch sodium glycolate, talc or magnesium stearate. The excipients for the liposomal or microcapsule forms can be poly(alkyl cyano-acrylates) or phospholipids.

The coating of the tablets can be carried out with additives such as hydroxypropyl methylcellulose, various acrylic polymers, propylene glycol and titanium dioxide.

The preparations for oral administration can contain artificial flayours and sweeteners such as sugar or aspartame.

The injectable solution preparations will be made up with water which will contain stabilization agents, solubilization agents, such as sodium chloride, mannitol and sorbitol, and/or buffers necessary for the injectable solutions.

The preparations for suppositories can use excipients such as semi-synthetic glycerides.

The preparations for creams will be made, inter alia, by the addition of nonionic surface-active agents.

The preparations for aerosol administration can be made from the micronized active principle, in combination with a surface-active agent such as sorbitan trioleate, in a carrier gas such as CFC-11 and -12 or any other substituted carrier gas.

The compounds of the invention can also be used in combination with any other substance of therapeutic use, for example diuretics, beta-blockers, PAF-acether antagonists, TxA₂ antagonists, converting enzyme inhibitors, beta-adrenergic inhibitors and anti-arrhythmics.

The daily doses of active principle, administered once or a number of times, can be between 0.0001 and 100 mg/kg of body weight and preferably between 0.001 and 1 mg/kg. However, these limits can be exceeded in the event of necessity.

A formulation example of a tablet and of a gelatin capsule according to the invention will be given below.

    ______________________________________     Tablet formulation example:     Compound of formula 91                        5 mg     Microcrystalline cellulose                        90 mg     Lactose            144 mg     Starch sodium glycolate                        10 mg     Magnesium stearate 1 mg                        250 mg     Gelatin capsule formulation example:     Compound of formula 111                        10 mg     Microcrystalline cellulose                        109 mg     Lactose            100 mg     Starch             30 mg     Magnesium stearate 1 mg                        250 mg     ______________________________________

The following examples illustrate the invention is a non-limiting way.

In the proton nuclear magnetic resonance (¹ H NMR) data, the following abbreviations have been used: ppm for part per million; s for singlet; d for doublet; t for triplet; q for quartet; b for broad; J for the couplings expressed in hertz; dd for double doublet.

EXAMPLE 1

7-Bromo-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₈ BrNo₂ MM=348.239 ##STR25##

A solution of n-butyllithium (1.6 mol/l) in hexane (93 ml, 0.15 mol) and of anhydrous diethyl ether (200 ml) is cooled to -78° C. under a dry nitrogen stream. A solution of 2-bromopyridine (14.3 ml, 0.15 mol) in diethyl ether (100 ml) is added over 1 hour and the mixture is then stirred for a further 0.5 hour at -78° C.

A solution of 7-bromo-3,3-dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one (13.5 g, 0.05 mol) in dry benzene (150 ml) is added over 1 hour at -78° C. Stirring is continued for 1.5 hours at -78° C. and 1 hour at -15° C. Ice-cold water (100 ml) is then added via a dropping funnel and extraction is carried out with diethyl ether. The organic phase is washed with water and dried over anhydrous sodium sulfate. The solution is concentrated under reduced pressure (brown oil).

[yellow solid; 14 g; M.p.=124°-128° C.; hexane; 80%]IR in cm⁻¹ : 3340, 2950, 1595, 1580 ¹ H NMR (CDCl₃) in ppm: 8.50 (1H, dd, J=4.5 Hz), 7.20 (6H, m), 5.75 (1H, s), 4.08 (1H, d, J=11 Hz), 3.80 (1H, d, J=11 Hz), 2.34 (1H, d, J=13.5 Hz), 1.66 (1H, d, J=13.5 Hz), 1.06 (3H, s), 0.86 (3H, s).

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    58.56    5.28   22.95  4.02     % Calculated                58.63    5.21   22.95  4.02 9.19     ______________________________________

By using the same process, the following compounds are prepared.

7-Chloro-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₈ ClNO₂ MM=303.788 ##STR26## [flash chromatography: CH₂ Cl₂ ; M.p.=118° C.; hexane 83%]IR in cm⁻¹ : 3340, 2950, 1595, 1570.

¹ H NMR (CDCl₃) in ppm: 8.54 (1H, dd, J=1.5 Hz), 7.22 (6H, m), 5.75 (1H, s), 4.11 (1H, d, J=11 Hz), 3.85 (1H, d, J=11 Hz), 2.37 (1H, d, J=13.5 Hz), 1.71 (1H, d, J=13.5 Hz), 1.07 (3H, s), 0.88 (3H, s). 7-Fluoro-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetrahydro-1-benzoxepin-5 -ol C₁₇ H₁₈ FNO₂ MM=287.333 ##STR27## [M.p.=110° C.; hexane; 64%]IR in cm⁻¹ : 3320, 2960, 1595, 1580. ¹ H NMR (CDCl₃) in ppm: 8.50 (1H, dd, J=4.5 Hz), 7.05 (6H, m), 5.65 (1H, s), 4.05 (1H, d, J=12 Hz), 3.80 (1H, d, J=12 Hz), 2.42 (1H, d, J =14 Hz), 1.75 (1H, d, J=14 Hz), 1.09 (3H, s), 0.88 (3H, s). 3,3-Dimethyl-5-(2-pyridyl)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₉ NO₂ MM=269.343 ##STR28## [chromatography with silica gel and CH₂ Cl₂ ; oil; 87%]IR in cm⁻¹ : 3360, 2950, 1595, 1580 ¹ H NMR (CDCl₃) in ppm: 8.46 (1H, dd, J=4.5 Hz), 7.15 (6H, m), 5.75 (1H, m), 4.15 (1H, d, J=12 Hz), 3.85 (1H, d, J=12 Hz), 2.37 (1H, d, J=13.5 Hz), 1.70 (1H, d, J=13.5 Hz), 1.10 (3H, s), 0.92 (3H, s). 3,3,7-Trimethyl-5-(2-pyridyl)-2,3,4,5- tetrahydro-1-benzoxepin-5-ol ##STR29## [M.p.=126° C.; hexane; 66%]IR in cm⁻¹ : 3310, 2960, 1595, 1575, 1500 ¹ H NMR (CDCl₃) in ppm: 8.52 (1H, dd, J=4.5 Hz), 7.05 (6H, m), 5.63 (1H, m), 4.07 (1H, d, J=11 Hz), 3.85 (1H, d, J=11 Hz), 2.41 (1H, d, J=13.5 Hz), 2.10 (3H, s), 1.74 (1H, d, J=13.5 Hz), 1.09 (3H, s), 0.88 (3H, s). 7-Ethyl-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetrahydro- -1-benzoxepin-5-ol C₁₉ H₂₃ NO₂ MM=297.396 ##STR30## [chromatography with silica gel and dichloromethane/ methanol: 98/2; M.p.=84° C.; hexane; 76%]IR in cm⁻¹ : 3350, 2970, 1595, 1565, 1500 7-Isopropyl-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetra-hydro-1-benzoxepin -5- ol C₂₀ H₂₅ NO₂ MM=311.423 ##STR31## [M.p.=72° C.; crystallizes from pentane; 72%]IR in cm⁻¹ : 3310, 2960, 1585, 1495 ¹ H NMR (CDCl₃) in ppm: 8.50 (1H, m) , 7.53 (1H, m) , 6.91 (5H, m), 5.63 (1H, s), 4.10 (1H, d, J=11 Hz), 3.82 (1H, d, J=11 Hz), 2.68 (1H, m), 2.38 (1H, d, 13.5 Hz), 1.70 (1H, d, 13.5 Hz), 1.02 (12H, m). 3,3-Dimethyl-7-(1-methylpropyl)-5-(2-pyridyl) -2,3,4,5- tetrahydro-1-benzoxepin-5-ol C₂₁ H₂₇ NO₂ MM=325.450 ##STR32## [chromatography with silica gel and dichloromethane/ heptane: 80/20; 33 %]IR in cm⁻¹ : 3370, 2970, 1600, 1580, 1500 ¹ H NMR (CDCl₃) in ppm: 8.46 (1H, m) , 7.05 (6H, m) , 5.65 (1H, s), 4.09 (1H, d, J=11 Hz), 3.79 (1H, d, J=11 Hz), 2.35 (1H, d, J=13.5 Hz), 2.22 (1H, m), 1.65 (1H, d, J=13.5 Hz), 1.06 (14H, m). 7-Methoxy-3,3-dimethyl-5-(2-pyridyl) -2,3,4,5-tetrahydro -1-benzoxepin-5-ol C₁₈ H₂₁ NO₃ MM=299.369 ##STR33## [chromatography with silica gel and dichloromethane/ methanol: 95/5; M.p. 98° C.; hexane; 68%]IR in cm⁻¹ : 3270, 2970, 1595, 1575, 1500 ¹ H NMR (CDCl₃) in ppm: 8.50 (1H, dd, J=4.5 Hz), 7.05 (6H, m), 5.53 (1H, s), 3.89 (2H, s), 3.55 (3H, s), 2.42 (1H, d, J=13.5 Hz), 1.76 (1H, d, J=13.5 Hz), 1.04 (3H, s), 0.80 (3H, s). 3,3-Dimethyl-5-(2-pyridyl)-7-trifluoromethoxy-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₈ H₁₈ F₃ NO₃ MM=353.340 ##STR34## [chromatography with silica gel and dichloromethane; M.p.=76° C.; heptane; 62%]IR in cm⁻¹ : 3290, 2950, 1590, 1485 ¹ H NMR (CDCl₃) in ppm: 8.52 (1H, m), 7.13 (6H, m), 5.78 (1H, s), 4.16 (1H, d, J=11 Hz), 3.84 (1H, d, J=11 Hz), 2.39 (1H, d, J=13.5 Hz), 1.73 (1H, d, J=13.5 Hz), 1.10 (3H, s), 0.90 (3H, S). 3,3-Dimethyl-7-methylthio-5-(2-pyridyl)-2,3,4,5-tetra -hydro-1-benzoxepin-5-ol C₁₈ H₂₁ NO₂ S MM=315.435 ##STR35## [B.p.₀.2 mm Hg =180° C.; 69%]IR in cm¹ : 3340, 2970, 1595, 1575 ¹ H NMR (CDCl₃) in ppm: 8.53 (1H, m) , 7.23 (6H, m) , 5.70 (1H, s) , 4.10 (1H, d, J=11 Hz), 3.81 (1H, d, J=11 Hz), 2.36 (1H, d, J=14 Hz), 2.25 (3H, s), 1.71 (1H, d, J=14 HZ), 1.09 (3H, s), 0.89 (3H, s). 3,3-Dimethyl-7-phenyl-5-(2-pyridyl)-2,3,4,5-tetrahydro -1-benzoxepin-5-ol C₂₃ H₂₃ NO₂ MM=345.440 ##STR36## [chromatography with silica gel and dichloromethane; M.p.=140°-150° C.; heptane; 95%]IR in cm⁻¹ : 3290, 2930, 1600 ¹ H NMR (CDCl₃) in ppm: 8.50 (1H, m) , 7.22 (11H, m) , 5.82 (1H, m), 4.20 (1H, d, J=11 Hz), 3.89 (1H, d, J=11 Hz), 2.41 (1H, d, J=14 Hz), 1.75 (1H, d, J=14 Hz), 1.13 (3H, s), 0.95 (3H, s). 8-Bromo-3,3 -dimethyl-5-(2-pyridyl)-2,3,4,5-tetrahydro- -1-benzoxepin-5-ol C₁₇ H₁₈ BrNO₂ MM=348.239 ##STR37## [chromatography with silica gel and dichloromethane; M.p.=110° C.; crystallization from hexane; 85%]IR in cm⁻¹ : 3300, 2950, 1595, 1565, 1480 ¹ H NMR (CDCl₃) in ppm: 8.55 (1H, m) , 7.55 (1H, dd, J=1.5 Hz, J=7.5 Hz), 7.07 (4H, m), 6.57 (1H, d, J=8 Hz), 5.87 (1H, m), 4.20 (1H, d, J=11 Hz), 3.90 (1H, d, 11 Hz), 2.37 (1H, d, J =13.5 Hz), 1.71 (1H, d, J=13.5 Hz), 1.12 (3H, s), 0.92 (3H, s) . 6,8-Dichloro-3,3-dimethyl-5-(2-pyridyl) -2,3,4,5-tetra-hydro-1-benzoxepin-5-ol C₁₇ H₁₇ Cl₂ NO₃ MM=33.233 ##STR38## [M.p.=156° C.; heptane; 76%]IR in cm⁻¹ : 3350, 3060, 2950, 1585, 1550 ¹ H NMR (CDCl₃) in ppm: 8.49 (1H, m) , 7.12 (5H, m) , 5.81 (1H, s), 4.16 (1H, d, J=10.5 Hz), 3.92 (1H, d, J=10.5 Hz), 2.12 (1H, d, J=14 Hz), 1.52 (1H, d, J=14 Hz), 1.19 (3H, s), 0.98 (3H, s). 7,8-Dichloro-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetra-hydro -1-benzoxepin-5-ol C₁₇ H₁₇ Cl₂ NO₂ MM=338.233 ##STR39## [M.p.=128° C.; hexane; 73%]IR in cm⁻¹ : 3350, 2970, 1595, 1585, 1550 ¹ NMR (CDCl₃) in ppm: 8.51 (1H, m) , 7.35 (3H, m) , 7.08 (1H, s) , 6.83 (1H, s) , 5.77 (1H, s) , 4.12 (1H, d, J=11 Hz), 3.83 (1H, d, J=11 Hz), 2.34 (1H, d, J=13.5 Hz), 1.70 (1H, d, J=13.5 Hz), 1.06 (3H, s), 0.88 (3H, s) . 7,9-Dichloro-3,3 -dimethyl-5- (2-pyridyl) -2,3,4,5-tetra-hydro-1-benzoxepin- -5-ol C₁₇ H₁₇ Cl₂ NO₂ MM=338.233 ##STR40## [chromatography with silica gel and dichloromethane; 83% IR in cm⁻¹ : 3300, 2950, 1590, 1570, 1560 ¹ H NMR (CDCl₃) in ppm: 8.52 (1H, m), 7.25 (5H, m), 5.70 (1H, s), 4.00 (2H, s), 2.39 (1H, d, J =14 Hz), 1.76 (1H, d, J=14 Hz), 1.05 (3H, s), 0.86 (3H, s). 8,9-Dichloro-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetra-hydro -1-benzoxepin-5-ol C₁₇ H₁₇ Cl₂ NO₂ MM=338.233 ##STR41## [yellow oil; 37%]IR in cm⁻¹ : 3300, 2960, 1595, 1585, 1560 ¹ H NMR (CDCl₃) in ppm: 8.52 (1H, m) , 7.15 (5H, m) , 5.76 (1H, s), 4.07 (2H, s), 2.37 (1H, d, J =13.5 Hz) , 1.72 (1H, d, J=13.5 Hz), 1.10 (3H, s), 0.90 (3H, s). 7,8-Difluoro-3,3-dimethyl-5-(2-pyridyl) -2,3,4,5-tetra-hydro -1-benzoxepin-5-ol C₁₇ H₁₇ F₂ NO₂ MM=305.324 ##STR42## [M.p.=93° C.; crystallizes from pentane; 61%]IR in cm⁻¹ : 3320, 2990, 1600, 1575, 1505 ¹ H NMR (CDCl₃) in ppm: 8.52 (1H, m), 7.61 (1H, m), 6.84 (4H, m), 5.71 (1H, s), 4.08 (1H, d, J=11 Hz), 3.83 (1H, d, J=11 Mz), 2.35 (1H, d, J=13.5 Hz), 1.70 (1H, d, J=13.5 Hz), 1.06 (3H, s), 0.87 (3H, s). 8-Chloro-7-fluoro-3,3-dimethyl-5-(2-pyridyl) -2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₇ ClFNO₂ MM=321.778 ##STR43## [M.p.=100° C.; hexane; 77%]IR in cm⁻¹ : 3310, 2965, 1595, 1585, 1485 ¹ H NMR (CDCl₃) in ppm: 8.55 (1H, m) , 7.61 (1H, m) , 7.10 (3H, m), 6.63 (1H, d), 5.70 (1H, s), 4.08 (1H, d, J=6 Hz), 3.83 (1H, d, J=6 Hz), 2.40 (1H, d, J=13.5 Hz), 1.75 (1H, d, J=13.5 Hz), 1.08 (3H, s), 0.86 (3H, s). 9-Ethyl-7-fluoro-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetrahydro -1-benzoxepin-5-ol C₁₉ H₂₂ FNO₂ MM=315.387 ##STR44## [M.p.=100° C.; crystallizes from pentane; 68%]IR in cm⁻¹ : 3260, 2965, 1590 ¹ H NMR (CDCl₃) in ppm: 8.53 (1H, m) , 7.04 (5H, m) , 5.45 (1H, s), 3.85 (2H, s), 2.70 (2H, q), 2.40 (1H, d, J=13.5 Hz), 1.75 (1H, d, J=13.5 Hz), 1.19 (3H, t), 1.02 (3H, s), 0.78 (3H, s). 7,8-Dimethoxy-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetra-hydro-1-benzoxepin-5-ol C₁₉ H₂₃ NO₄ MM=329.395 ##STR45## [chromatography with silica gel and dichloromethane/ methanol: 98/2; M.p.=90° C.; crystallization from heptane; 63%]

IR in cm⁻¹ : 3370, 2950, 1610, 1590, 1505 ¹ H NMR (CDCl₃) in ppm: 8.52 (1H, m) , 7.56 (1H, m) , 7.06 (3H, m) , 6.54 (1H, s), 6.31 (1H, s) , 5.50 (1H, m) , 4.08 (1H, d, J=10 Hz), 3.81 (3H, s), 3.80 (1H, d, J=10 Hz), 3.55 (3H, s), 2.38 (1H, d, J=13 Hz), 1.73 (1H, d, J=13 Hz), 1.08 (3H, s), 0.85 (3H, s). 7-Bromo -3,3,8- trimethyl-5-(2-pyridyl)-2,3,4,5- tetrahydro-1-benzoxepin-5-ol C₁₈ H₂₀ BrNO₃ MM=362.266 ##STR46## [chromatography with silica gel and dichloromethane; M.p.=147° C.; crystallizes from hexane; 63%]IR in cm⁻¹ : 3360, 2970, 1595, 1570, 1540 ¹ H NMR (CDCl₃) in ppm: 8.54 (1H, m), 7.60 (1H, m), 7.05 (4H, m), 5.70 (1H, m), 4.10 (1H, d, J=11 Hz), 3.81 (1H, d, 11 Hz), 2.35 (1H, d, J=13.5 Hz), 2.27 (3H, s), 1.69 (1H, d, J=13.5 Hz), 1.07 (3H, s), 0.88 (3H, s). 8-Bromo-3,3,7-trimethyl-5-(2-pyrldyl)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₈ H₂₀ BrNO₂ MM=362.266 ##STR47## [chromatography with silica gel and dichloromethane; m.p.=129° C.; crystallizes from hexane; 70%]IR in cm⁻¹ : 3320, 2950, 1595, 1560 ¹ H NMR (CDCl₃) in ppm: 8.52 (1H, m), 7.55 (1H, m), 7.14 (1H, s) , 7.04 (2H, m) , 6.62 (1H, s) , 5.64 (1H, s) , 4.05 (1H, d, J=11 Hz), 3.80 (1H, d, J=11 Hz), 2.32 (1H, d, J=13.5 Hz), 2.11 (3H, s), 1.67 (1H, d, J=13.5 Hz), 1.05 (3H, s) , 0.66 (3H, s). 3,3-Dimethyl-5-(2-pyridyl)-2,3,4,5,7,8,9,10-octahydro-1-naphth [2,3-b]oxepin-5-ol C₂₁ H₂₅ NO₂ MM{32 323.434 ##STR48## [chromatography with silica gel and dichloromethane; M.p.=134° C.; 67%]IR in cm⁻¹ : 3330, 3060, 2930, 1620, 1595, 1570, 1500 ¹ H NMR (CDCl₃) in ppm: 8.50 (1H, m), 7.54 (1H, m), 7.08 (2H, m), 6.66 (1H, s), 6.50 (1H, s), 5.50 (1H, s), 4.02 (1H, d, J=10.5 Hz), 3.77 (1H, d, J=10.5 Hz), 2.56 (4H, m), 2.36 (1H, d, J=13.5 Hz), 1.74 (5H, m), 1.05 (3H, s), 0.83 (3H, s). 3,3-Dimethyl-5-(2-pyridyl)-7-trifluoromethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₈ H₁₈ F₃ NO₂ MM=337.341 ##STR49## [chromatography with silica gel and dichloromethane; M.p.=116° C.; crystallization from leooctane; 29%]IR in cm⁻¹ : 3330, 2970, 1625, 1600, 1580, 1505 ¹ H NMR (CDCl₃) in ppm: 8.50 (1H, dd, J=4.5 Hz), 7.25 (6H, m), 5.90 (1H, s), 4.22 (1H, d, J=11 Hz), 3.90 (1H, d, J=11 Hz), 2.35 (1H, d, J=13.5 Hz), 1.72 (1H, d, J=13.5 Hz), 1.10 (3H, s), 0.92 (3H, s). 3,3-Dimethyl-5-(2-pyridyl)-8-trifluoromethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₈ H₁₈ F₃ NO₂ MM=337.341 ##STR50## [chromatography with silica gel and dichloromethane; M.p.=78° C.; 31%]IR in cm⁻¹ : 3330, 2970, 1595, 1575, 1500 ¹ H NMR (CDCl₃) in ppm: 8.55 (1H, dd, J=4.5 Hz), 7.25 (6H, m), 5.94 (1H, s), 4.22 (1H, d, J=11 Hz), 3.90 (1H, d, J=11 Hz), 2.40 (1H, d, J=14 Hz), 1.72 (1H, d, J=14 Hz), 1.12 (3H, s), 0.95 (3H, s). 3,3-Dimethyl-5-(2-pyridyl)-7-pentafluoroethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₉ H₁₈ F₅ NO₂ MM=387.349 ##STR51## [chromatography with silica gel and dichloromethane; 42%]IR in cm⁻¹ : 3330, 2950, 1620, 1595, 1575, 1500 ¹ H NMR (CDCl₃) in ppm: 8.55 (1H, dd, J=4.5 Hz), 7.28 (6H, m), 6.00 (1H, s), 4.33 (1H, d, J=11 Hz), 3.94 (1H, d, J=11 Hz), 2.38 (1H, d, J=14 Hz), 1.75 (1H, d, J=14 Hz), 1.15 (3H, s), 0.97 (3H, s). 8-Bromo-3,3-dimethyl-1-(2-pyridyl)-2,3,4,5-tetrahydro-1H-benzo [f]-cyclohepten-1-ol C₁₈ H₂₀ BrNO MM=346.266 ##STR52## [chromatography with silica gel and dichloromethane; oil; 78%]IR in cm⁻¹ : 3340, 2960, 1590, 1570 ¹ H NMR (CDCl₃) in ppm: 8.50 (1H, m) , 7.54 (1H, m) , 7.04 (5H, m), 5.39 (1H, s), 2.90 (2H, m), 2.32 (1H, d, J=14 Hz), 1.77 (1H, d, J=14 Hz), 1.70 (2H, m), 1.02 (6H, m). 7-Bromo-3,3-dimethyl-5-(3-pyridyl)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₈ BrNO₂ MM=348.234 ##STR53##

By using the same process as above and the use of 3-bromopyridine replacing 2-bromopyridine. [M.p.=170° C.; ethyl acetate; 46%]IR in cm⁻¹ : 3120, 2950, 1585, 1475 ¹ H NMR (CDCl₃) in ppm: 8.37 (2H, m) , 7.14 (4H, m) , 6.88 (1H, d, J=9 Hz), 3.76 (2H, s), 3.74 (1H, m), 2.35 (1H, d, J=13.5 Hz), 2.00 (1H, d, J=13.5 Hz), 1.01 (3H, s), 0.62 (3H, s) . 7,8-Dichloro-3,3-dlmethyl-5-(3-pyridyl)-2,3,4,5-tetra-hydro-1-benzoxepin-5-ol C₁₇ H₁₇ Cl₂ NO₂ MM=338.233 ##STR54## [M.p.=166° C.; crystallization from heptane; 44%]IR in cm⁻¹ : 3100, 2930, 1595, 1585 ¹ H NMR (CDCl₃) in ppm: 8.41 (2H, m) , 7.34 (4H, m) , 3.76 (3H, s), 2.35 (1H, d, J=13.5 Hz); 2.00 (1H, d, J=13.5 Hz), 1.00 (3H, s), 0.61 (3H, s).

EXAMPLE 2

7-Bromo-5-methoxy-3,3,-dimethyl-5-(2-pyridyl)-1-benzoxepine C₁₈ H₂₀ BrNO₂ MM=362.265 ##STR55##

A solution of 7-bromo-3,3-dimethyl-5-(2-pyridyl)-1-benzoxepin-5-ol (5 g, 0.014 mol) in anhydrous DMF (50 ml) is added dropwise to a suspension of sodium hydride (50% dispersed in oil, 0.8 g, 0.0168 mol) in anhydrous DMF (25 ml), the temperature rises to 88° C., stirring is continued for 1 hour and the reaction mixture is maintained at 80° C. A solution of methyl iodide (1.9 g, 0.014 mol) in anhydrous DMF (10 ml) is then added dropwise at 25° C.

The whole mixture is stirred for 16 hours at 25° C. and then hydrolysed with 600 ml of ice-cold water. The paste obtained is dissolved in dichloromethane (250 ml). The organic phase is washed with water, dried over anhydrous sodium sulfate and concentrated under reduced pressure.

[pasty product; 5 g; 98%]IR in cm⁻¹ : 2960, 1590, 1565 ¹ H NMR (CDCl₃) in ppm: 8.55 (1H, dd, J=4.5 Hz) , 7.33 (6H, m), 3.91 (1H, s), 3.88 (1H, s), 3.16 (3H, s), 2.26 (2H, s), 1.11 (3H, s), 0.43 (3H, s).

EXAMPLE NO. 3

7-Bromo-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetrhydro-1-benzoxepin-5-yl acetate C₁₉ H₂₀ BrNO₃ MM=390.276 ##STR56##

A solution of 7-bromo-3,3-dimethyl-5-(2-pyridyl)-1-benzoxepin-5-ol (5 g, 0.014 mol) in anhydrous DMF (50 ml) is added dropwise at 60° C. to a suspension of sodium hydride (50% dispersed in oil, 0.8 g, 0.0168 mol) in anhydrous DMF (25 ml).

The suspension is stirred for 1 hour at 60° C. and then cooled. Acetyl chloride (1 g, 0.014 mol) is added dropwise at 25° C. and the stirring is continued at 25° C. for 16 hours. The whole mixture is then hydrolysed in 600 ml of ice-cold water. The beige paste obtained is dissolved in 200 ml of dichloromethane. The organic phase is washed with water, dried over anhydrous sodium sulfate and concentratedunder reduced pressure. The oil obtained is purified by chromatography with silica gel and dichloromethane/methanol: 98/2.

[M.p.=140° C.; hexane; 22%]IR in cm⁻¹ : 2950, 1745, 1590, 1570, 1485 ¹ H NMR (CDCl₃) in ppm: 8.50 (1H, dd, J=4.5 Hz), 7.25 (6H, m), 3.78 (2H, s), 2.95 (1H, d, J=13.5 Hz), 2.38 (1H, d, J=13.5 Hz), 2.07 (3H, 8) , 1.05 (3H, 8) , 0.37 (3H, s).

EXAMPLE NO. 4

7-Bromo-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₈ BrNO₃ MM=364.238 ##STR57##

A solution of 7-bromo-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol (3.5 g, 0.01 mol) and of 3 -chloroperbenzoic acid (2.8 g, 0.016 mol) in dichloromethane (50 ml) is stirred for 16 hours at 25° C.

The precipitate formed is filtered. The filtrate is washed with a 5% sodium bisulfite solution, then with a 5% sodium bicarbonate solution and with water. The organic phase is dried over anhydrous sodium sulfate and concentrated under reduced pressure (thick yellow oil). The product is recrystallized from hexane (2.6 g).

[M.p.=139°-140° C.; hexane]IR in cm⁻¹ : 3240, 3050, 2950, 1480 ¹ H NMR (CDCl₃) in ppm: 8.18 (1H, m) , 7.88 (1H, d) , 7.13 (5H, m), 6.03 (1H, m), 3.81 (1H, m), 3.49 (1H, m), 3.31 (1H, m), 1.94 (1H, d, J=13.5 Hz), 0.86 (3H, s) , 0.51 (3H, s).

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    56.07    5.02          3.73 13.42     % Calculated                56.05    4.98   21.94  3.85 13.18     ______________________________________

By using the same process, the following compounds are prepared.

7-Chloro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro -1-benzoxepin-5-ol C₁₇ H₁₈ ClNO₃ MM=319.787 ##STR58## [M.p.=138°-140° C.; ethyl acetate; 34%]IR in cm⁻¹ : 3250, 3070, 2950, 1480 ¹ H NMR (CDCl₃) in ppm: 8.23 (1H, m), 7.77 (1H, d), 7.11 (5H, m), 6.05 (1H, m), 3.82 (1H, m), 3.50 (1H, m), 3.32 (1H, m), 1.93 (1H, d, J=14 Hz), 0.85 (3H, s), 0.56 (3H, s).

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    63.58    5.71   11.04  4.47     % Calculated                63.85    5.67   11.09  4.38 15.01     ______________________________________

7-Fluoro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro -1-benzoxepin-5-ol C₁₇ H₁₈ FNO₃ MM=303.332 ##STR59## [M.p.=110°-112° C.; hexane 78%]IR in cm⁻¹ : 3390, 3110, 2950, 1485 ¹ H NMR (CDCl₃) in ppm: 8.19 (1H, m), 7.30 (7H, m), 3.80 (1H, m) , 3.48 (1H, m) , 3.34 (1H, m) , 1.93 (1H, d, J=14 Hz), 0.85 (6H, s).

    ______________________________________     Elemental analysis              C      H      F        N    O     ______________________________________     % Found    67.14    6.04   6.16   4.53     % Calculated                67.31    5.98   6.26   4.62 15.82     ______________________________________

3,3-Dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₉ NO₃ MM=285.342 ##STR60## [chromatography with silica gel and ethyl acetate/ chloroform/methanol; 60/30/10; M.p.=127°-128° C.; cyclohexane; 41% ]IR in cm⁻¹ : 3180, 3070, 2950, 1605, 1575, 1480 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m) , 7.75 (1H, m) , 7.05 (6H, m), 3.81 (1H, m), 3.52 (1H, m), 3.32 (1H, m), 1.97 (1H, d, J=14 Hz), 0.88 (3H, s), 0.60 (3H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      71.58  6.88       4.85     % Calculated 71.56  6.71       4.91 16.82     ______________________________________

7 -Ethyl-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₉ H₂₃ NO₃ MM=313.396 ##STR61## [chromatography with silica gel and dichloromethane/ methanol; 98/2; M.p.=123°-125° C.; diisopropyl ether; 23%]IR in cm⁻¹ : 3230, 3050, 2950, 1615, 1580, 1500 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m), 7.60 (1H, m), 7.11 (5H, m), 6.50 (1H, m), 3.80 (1H, m), 3.50 (1H, m), 3.30 (1H, m), 2.64 (2H, q), 1.93 (1H, d, J=13.5 Hz), 1.21 (3H, t), 0.83 (3H, s), 0.54 (3H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      73.03  7.49       4.57     % Calculated 72.82  7.40       4.47 15.32     ______________________________________

3,3 -Dimethyl-7-(1-methylpropyl)-5-(2-pyridyl N-oxide) -2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₂₁ H₂₇ NO₃ MM=341.449 ##STR62## [chromatography with silica gel and dichloromethane; M.p.=131°-133° C.; diisopropyl ether; 39%]IR in cm⁻¹ : 3150, 2960, 1610, 1495 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m), 7.20 (7H, m), 3.77 (1H, d, J=11 Hz), 3.48 (1H, d, J=11 Hz), 3.28 (1H, d, J=14 Hz), 2.58 (1H, q), 1.92 (1H, d, J=14 Hz), 1.10 (14H, m).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      73.66  7.97       4.39     % Calculated 73.87  7.97       4.10 14.06     ______________________________________

7-Methoxy-3,3-dimethyl-5-(2-pyridyl-N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₈ H₂₁ NO₄ MM=315.368 ##STR63## [chromatography with silica gel and dichloromethane/ methanol; 98/2; M.p.=109°-110° C.; isooctane]IR in cm⁻¹ : 3200, 3080, 2950, 1605, 1495 ¹ H NMR (CDCl₃) in ppm: 8.19 (1H, m), 7.15 (7H, m), 3.74 (3H, s), 3.58 (3H, m), 1.90 (1H, d, a=13.5 Hz), 0.82 (3H, s), 0.55 (3H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      68.52  6.55       4.48     % Calculated 68.55  6.71       4.44 20.29     ______________________________________

3,3-Dimethyl-5-(2-pyridyl N-oxide)-7-trifluoromethoxy-2,3,4,5-tetrahydro -1-benzoxepin-5-ol C₁₈ H₁₈ F₃ NO₄ MM=370.348 ##STR64## [chromatography with silica gel and dichloromethane; M.p.=114°-116° C.; heptane; 50%]IR in cm⁻¹ : 3400, 3130, 3060, 2970, 1490 ¹ H NMR (CDCl₃) in ppm: 8.21 (1H, m) , 7.64 (1H, m) , 7.01 (6H, m), 3.80 (1H, d, J=11 Hz), 3.49 (1H, d, J=11 Hz), 3.30 (1H, d, J=14 Hz), 1.91 (1H, d, J=14 Hz), 0.84 (3H, s), 0.52 (3H, s).

    ______________________________________     Elemental analysis              C      H      F        N    O     ______________________________________     % Found    58.33    4.95   15.31  3.86     % Calculated                58.53    4.91   15.43  3.79 17.33     ______________________________________

3,3-Dimethyl-7-phenyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin -5-ol C₂₃ H₂₃ NO₃ MM=361.440 ##STR65## [chromatography with silica gel and methanol; M.p.=175° C.; diisopropyl ether/ethyl acetate; 50/50; 25%]IR in cm⁻¹ : 3200, 2960, 1610 ¹ H NMR (CDCl₃) in ppm: 8.14 (2H, m), 7.27 (10H, m), 3.85 (1H, d, J=11 Hz), 3.55 (1H, d, J=11 Hz), 3.34 (1H, d, J=14 Hz), 2.02 (1H, d, J=14 Hz), 0.90 (3H, s), 0.60 (3H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      76.57  6.37       3.90     % Calculated 76.43  6.41       3.88 13.28     ______________________________________

7-Bromo-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetra-hydro-1-benzoxepin-5-ol C₁₇ H₁₈ BrNO₃ MM=364.238 ##STR66## [M.p.=137°-138° C.; ethyl acetate; 20%]IR in cm⁻¹ : 3090, 2950, 1590, 1560, 1475 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m) , 7.65 (1H, m) , 7.62 (1H, d, J=8 Hz), 7.03 (5H, m), 3.81 (1H, d, J=11 Hz), 3.50 (1H, d, J=11 Hz), 3.29 (1H, d, J=14 Hz), 1.92 (1H, d, J=14 Hz), 0.88 (3H, s), 0.53 (3H, s). 6,8-Dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₇ Cl₂ NO₃ MM=354.232 ##STR67## [M.p.=220° C.; ethyl acetate; 35%]IR in cm⁻¹ : 3065, 2970, 1585, 1550 ¹ H NMR (CDCl₃) in ppm: 8.15 (1H, m), 6.92 (5H, m), 4.00 (2H, s), 2.18 (2H, s), 1.28 (3H, s), 1.00 (3H, s).

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    57.54    4.84   20.23  4.04     % Calculated                57.64    4.84   20.02  3.95 13.55     ______________________________________

7,8-Dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₇ Cl₂ NO₃ MM=354.232 ##STR68## [M.p.=134°-136° C.; diisopropyl oxide; 18%]IR in cm⁻¹ : 3250, 3050, 2970, 1480 ¹ H (CDCl₃) in ppm: 8.21 (1H, m), 7.85 (1H, s), 7.08 (5H, m), 3.80 (1H, d, J=11 Hz), 3.38 (2H, m), 1.90 (1H, d, J=14 Hz), 0.88 (3H, s), 0.55 (3H, s).

    ______________________________________     Elemental analysis              C      H      Cl       N    0     ______________________________________     % Found    57.80    4.70   19.73  4.02     % Calculated                57.64    4.84   20.02  3.95 13.55     ______________________________________

7,9-Dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₇ Cl₂ NO₃ MM=354.232 ##STR69## [M.p.=150.5° C.; diisopropyl ether; 33%]IR in cm⁻¹ : 3230, 3070, 2970, 1570 ⁻¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m), 7.70 (1H, m), 7.09 (4H, m), 3.89 (1H, dd, J=1.5 Hz, J=11 Hz), 3.40 (1H, d, J=11 Hz), 3.31 (1H, dd, J=1.5 Hz, J=13.5 Hz), 1.82 (1H, d, J=13.5 Hz) , 0.81 (3H, s) , 0.59 (3H, s).

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    57.38    4.89   20.02  3.99     % Calculated                57.64    4.84   20.02  3.95 13.55     ______________________________________

8-Chloro-7-fluoro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₇ ClFNO₃ MM=337.777 ##STR70## [M.p.=121°123° C.; diisopropyl oxide; 24%]IR in cm⁻¹ : 3290, 3070, 1485 ¹ H (CDCl₃) in ppm: 8.23 (1H, m), 7.87 (1H, s), 7.60 (1H, d), 7.08 (4H, m), 3.58 (3H, m), 1.90 (1H, d, J=14 Hz), 0.84 (3H, s), 0.55 (3H, s).

    ______________________________________     Elemental analysis            C    H        Cl     F      N    O     ______________________________________     % Found  60.44  5.30     10.56                                   5.69   4.16     % Calculated              60.45  5.07     10.50                                   5.63   4.15 14.21     ______________________________________

7,8-Dimethoxy-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₉ H₂₃ NO₅ MM=345.394 ##STR71## [chromatography with silica gel and dichloromethane/ methanol; 98/2; M.p.=174° C.; ethyl acetate]

IR in cm⁻¹ : 3220, 3090, 2970, 1615, 1510 ¹ H NMR (CDCl₃) in ppm: 8.22 (1H, m) , 7.18 (4H, m) , 6.62 (1H, s) , 3.87 (3H, s), 3.80 (3H, s) , 3.76 (1H, d, J=10 Hz), 3.50 (1H, d, J=10 Hz), 3.29 (1H, d, J=13 Hz), 1.92 (1H, d, J=13 Hz), 0.87 (3H, s), 0.55 (3H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      66.35  6.87       4.20     % Calculated 66.07  6.71       4.06 23.16     ______________________________________

3,3-Dimethyl-5-(2-pyridyl N-oxide)-7-trifluoromethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₈ H₁₈ F₃ NO₃ MM=353.340 ##STR72## [M.p.=106°-107° C.; hexane; 76%]IR in cm⁻ : 3400, 3110, 2950, 1615, 1590, 1500, 1480 ¹ H NMR (CDCl₃) in ppm: 8.05 (2H, m), 7.13 (6H, m) , 3.80 (1H, m), 3.50 (1H, m), 3.29 (1H, m), 1.95 (1H, d, J=13.5 Hz), 0.86 (3H, s), 0.54 (3H, s).

    ______________________________________     Elemental analysis              C      H      F        N    O     ______________________________________     % Found    61.40    5.08   16.01  4.01     % Calculated                61.18    5.14   16.13  3.96 13.58     ______________________________________

3,3-Dimethyl-5-(2-pyridyl N-oxide)-8-trifluoromethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₈ H₁₈ F₃ NO₃ MM=353.340 ##STR73## [chromatography with silica gel and dichloromethane/ methanol; 98/2; M.p.=102°-105° C.; cyclohexane; 27%]IR in cm⁻¹ : 3400, 3050, 2950, 1585, 1480 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m) , 7.37 (7H, m) , 3.86 (1H, m), 3.55 (1H, m) , 3.32 (1H, m) , 1.95 (1H, d, J=14 Hz), 0.88 (3H, s), 0.56 (3H, s). 7-Bromo-5-methoxy-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetrahydro-1-benzoxepine C₁₈ H₂₀ BrNO₃ MM=378.265 ##STR74## M.p.=178°-180° C.; ethyl acetate; 33%]IR in cm⁻¹ : 2960, 1595, 1560, 1480 ⁻¹ NMR (CDCl₃) in ppm: 8.06 (1H, m), 7.14 (6H, m), 3.98 (1H, d, J=11 Hz), 3.70 (1H, d, J=11 Hz), 3.33 (1H, d, J=14 Hz), 3.05 (3H, s), 1.61 (1H, d, J=14 Hz), 1.11 (3H, s), 0.95 (3H, s).

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    56.96    5.50   21.10  3.58     % Calculated                57.15    5.33   21.13  3.70 12.69     ______________________________________

EXAMPLE NO. 5

7-Bromo-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetra-hydro-1-benzoxepin-5-yl acetate C₁₉ H₂₀ BrNO₄ MM=406.275 ##STR75## M.p.=145°-147° C.; isooctane/ethyl acetate: 80-20/ IR in cm⁻¹ : 2950, 1730, 1605, 1480 ⁻¹ H NMR (CDCl₃) in ppm: 8.05 (1H, m), 7.17 (6H, m), 3.58 (3H, m), 2.19 (3H, s), 2.07 (1H, d, J=14 Hz), 0.93 (3H, s), 0.60 (3H, s).

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    56.20    5.05   19.75  3.40     % Calculated                56.17    4.96   19.67  3.45 15.75     ______________________________________

7-Bromo-4,5-epoxy-3,3 -dimethyl -5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₇ H₁₆ BrNO₃ MM=362.222 ##STR76## [chromatography with silica gel and ethyl acetate; M.p.=186°-187° C.; ethanol; 20%]IR in cm⁻¹ : 3060, 2970, 1560, 1480 ¹ H NMR (CDCl₃) in ppm: 8.05 (1H, m) , 7.22 (6H, m) , 3.75 (2H, s), 2.98 (1H, s), 1.46 (3H, s), 1.17 (3H, s).

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    56.14    4.51   22.27  3.76 13.07     % Calculated                56.37    4.45   22.06  3.87 13.26     ______________________________________

7-Bromo-3,3-dimethyl-5-(3-pyridy1 N-oxide)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₈ BrNO₃ MM=364.233 ##STR77## [M.p.=200° C.; ethanol; 38%]IR in cm⁻¹ : 3180, 2950, 1595, 1560, 1485 ¹ H NMR (DMSO) in ppm: 8.07 (2H, m) , 7.14 (5H, m) , 6.31 (1H, e), 3.78 (2H, s), 2.30 (1H, d, J=13.5 Hz), 1.88 (1H, d, J=13 Hz), 0.94 (3H, s), 0.69 (3H, s).

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    56.03    5.03   21.71  3.85     % Calculated                56.05    4.98   21.94  3.85 13.18     ______________________________________

7,8-Dichloro-3,3-dimethyl-5-(3-pyridyl N-oxide)-2,3,4,5 -tetrahydro-1-benzoxepin-5-ol C₁₇ H₁₇ Cl₂ NO₃ MM=354.232 ##STR78## [M.p.=226°-228° C.; isopropanol; 23%]IR in cm⁻¹ : 3160, 2950, 1590 ¹ H NMR (DMSO) in ppm: 8.05 (2H, m), 7.17 (4H, m), 6.32 (1H, s), 3.81 (2H, s), 2.30 (1H, d, J=14 Hz), 1.86 (1H, d, J=14 Hz), 0.96 (3H, s), 0.71 (3H, s).

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    57.75    5.12   19.84  4.06     % Calculated                57.64    4.84   20.02  3.95 13.55     ______________________________________

EXAMPLE NO. 6

7-Bromo-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₇ H₁₆ BrNo MM=330.224 ##STR79##

A solution of 7-bromo-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetrahydro-1-benzoxepin-5-ol (13.9 g, 0.04 mol) and of concentrated sulfuric acid (3.3 ml of commercial solution) in benzene (170 ml) is heated for 3 hours at boiling with removal of water.

The solution is washed, at 25° C., with a 1% sodium hydroxide solution and then with water. The organic phase is dried over anhydrous sodium sulfate and concentrated under reduced pressure.

[13.2 g; M.p.=113°-114° C.; hexane; 70%]IR in cm⁻¹ : 2950, 1580, 1560, 1480 ¹ H NMR (CDCl₃) in ppm: 8.62 (1H, m), 7.30 (6H, m), 5.90 (1H, s), 3.93 (2H, s), 1.20 (6H, s).

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    61.61    4.96   24.03  4.31     % Calculated                61.83    4.88   24.20  4.24 4.85     ______________________________________

By using the same process, the following compounds are prepared.

7-Chloro-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₇ H₁₆ ClNO MM=285.773 ##STR80## [M.p.=100° C.; hexane; 79%]IR in cm⁻¹ : 2960, 1585, 1565, 1490 ¹ NMR (CDCl₃) in ppm: 8.62 (1H, m) , 7.28 (6H, m) , 5.92 (1H, s), 3.91 (2H, s), 1.15 (6H, s). 7-Fluoro-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₇ H₁₆ FNO MM=269.318 ##STR81## [thick yellow oil; 38 %]IR in cm⁻¹ : 2970, 1590, 1565, 1495 ¹ H NMR (CDCl₃) in ppm: 8.55 (1H, m) , 7.02 (6H, m) , 5.89 (1H, s), 3.90 (2H, s), 1.16 (6H, s). 3,3-Dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₇ H₁₇ NO MM=251.327 ##STR82## [oil; 98%]IR in cm⁻¹ : 2960, 1590, 1565, 1495 ¹ H NMR (CDCl₃) in ppm: 8.56 (1H, m) , 7.20 (7H, m) , 5.83 (1H, s), 3.94 (2H, s), 1.18 (6H, s). 3,3,7-Trimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₈ H₁₉ NO MM=265.354 ##STR83## [oil; 98%]IR in cm⁻¹ : 2960, 1590, 1565, 1500 ¹ H NMR (CDCl₃) in ppm: 8.58 (1H, m) , 7.10 (6H, m) , 5.83 (1H, s), 3.91 (2H, s), 2.10 (3H, s), 1.18 (6H, s). 7-Ethyl-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₉ H₂₁ NO MM=279.381 ##STR84## [yellow oil; 97%]IR in cm⁻¹ : 2960, 1590, 1565, 1500 ¹ H NMR (CDCl₃) in ppm: 8.58 (1H, m) , 7.14 (6H, m) , 5.84 (1H, s), 3.91 (2H, s), 2.40 (2H, q), 1.16 (6H, s), 1.03 (3H, t). 7- Isopropyl-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₂₀ H₂₃ NO MM=293.408 ##STR85## [yellow oil; 98%]IR in cm⁻¹ : 2960, 1585, 1495 ¹ H NMR (CDCl₃) in ppm: 8.59 (1H, m) , 7.64 (1H, m) , 6.90 (5H, m), 5.84 (1H, s), 3.91 (2H, s), 2.68 (1B, m), 1.10 (12H, m). 3,3-Dimethyl-7-(1-methylpropyl)-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₂₁ H₂₃ NO MM=307.435 ##STR86## [yellow oil; 77%]IR in cm⁻¹ : 2965, 1585, 1565, 1500 ¹ H NMR (CDCl₃) in ppm: 8.59 (1H, m) , 7.29 (5H, m) , 6.54 (1H, s) , 5.86 (1H, s), 3.92 (2H, s), 2.31 (1H, m), 1.09 (14H, m). 7-Methoxy-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro- -1-benzoxepine C₁₈ H₁₉ NO₂ MM=281.353 ##STR87## [M.p.=80° C.; 78%]IR in cm⁻¹ : 2960, 1585, 1565, 1495 ¹ H NMR (CDCl₃) in ppm: 8.54 (1H, m), 7.00 (6H, m) , 5.85 (1H, s), 3.88 (2H, s), 3.50 (3H, s), 1.03 (6H, s). 3-Dimethyl-5-(2-pyridyl)-7-trifluoromethoxy-2,3-dihydro-1-benzoxepine C₁₉ H₁₆ F₃ NO₂ MM=335.325 ##STR88## [M.p.=112° C.; cyclohexane; 85%]IR in cm⁻¹ : 3070, 3045, 2960, 1585, 1560 ¹ H NMR (CDCl₃) in ppm: 8.59 (1H, m) , 7.66 (1H, m) , 7.13 (4H, m), 6.59 (1H, s), 5.91 (1H, s), 3.91 (2H, s), 1.17 (6H, s). 3,3 -Dimethyl-7-methylthio-5- (2-pyridyl) -2,3-dihydro-1-benzoxepine C₁₈ H₁₉ NOS MM=297.420 ##STR89## [B.p.₀.8 mm Hg =140°-160° C.; 60%]IR in cm⁻¹ : 2970, 2870, 1585, 1560 ¹ H NMR (CDCl₃) in ppm: 8.58 (1H, m), 7.65 (1H, m) , 6.96 (5H, m), 5.87 (1H, s), 3.90 (2H, s), 2.22 (3H, s), 1.19 (6H, s). 3,3 -Dimethyl-7-phenyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₂₃ H₂₁ NO MM=327.425 ##STR90## [M.p.=115°-120° C.; heptane; 42%]IR in cm⁻¹ : 3050, 2950, 1600 ¹ H NMR (CDCl₃) in ppm: 8.60 (1H, m), 7.30 (11H, m), 5.91 (1H, s), 3.99 (2H, s), 1.21 (6H, s). 8-Bromo-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₇ H₁₆ BrNO MM=330.224 ##STR91## [yellow oil; 90%]IR in cm⁻¹ : 3060, 2950, 1585, 1555, 1485, 1465 ¹ H NMR (CDCl₃) in ppm: 8.59 (1H, m) , 7.62 (1H, dd), 7.11 (4H, m), 6.61 (1H, d, J=8 Hz), 5.90 (1H, s), 3.95 (2H, s), 1.18 (6H, s). 7-Cyano-3,3-dimethyl-5-(2-pyridyl) -2,3-dihydro-1-benzoxepine C₁₈ H₁₆ N₂ O MM=276.337 ##STR92## [chromatography with silica gel and cyclohexane/ chloroform/methanol; 56/33/11; M.p.=155°-157° C., ethyl acetate; 57%]IR in cm⁻¹ : 2960, 2220, 1590, 1570, 1495 ¹ H NMR (CDCl₃) in ppm: 8.55 (1H, m) , 7.37 (6H, m) , 5.90 (1H, s), 3.95 (2H, s), 1.20 (6H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      78.06  5.94       10.14     % Calculated 78.23  5.84       10.14                                         5.79     ______________________________________

8-Cyano-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₈ H₁₆ N₂ O MM=276.337 ##STR93## [chromatography with silica gel and dichloromethane; M.p.=132° C.; crystallization from heptane; 30%]IR in cm⁻¹ : 2950, 2210, 1585, 1565, 1540, 1500 ¹ H NMR (CDCl₃) in ppm: 8.56 (1H, m) , 7.66 (1H, m) , 7.16 (4H, m) , 6.83 (1H, d, J=8 Hz), 6.01 (1H, s), 3.95 (2H, s), 1.19 (6H, s). 3,3-Dimethyl-5-(2-pyridyl)-7-trifluoromethyl-2,3-dlhydro-1-benzoxepine C₁₈ H₁₆ F₃ NO MM=319.326 ##STR94## [M.p.=90° C.; isooctane; 60%]IR in cm⁻¹ : 2960, 1585, 1565, 1500 3,3 -Dimethyl -5-(2-pyridyl )-8-trifluoromethyl-2,3-dihydro-1-benzoxepine C₁₈ H₁₆ F₃ NO MM=319.326 ##STR95## [oil; 85%]IR in cm⁻¹ : 2960, 1585, 1565, 1500 ¹ H NMR (CDCl₃) in ppm: 8.60 (1H, m) , 7.34 (6H, m) , 6.00 (1H, s), 3.98 (2H, s), 1.19 (6H, s). 3,3-Dimethyl-5-(2-pyridyl)-7-pentafluoroethyl-2,3-dihydro-1-benzoxepine C₁₉ H₁₆ F₅ NO MM=369.334 ##STR96## [oil; 90%]IR in cm⁻¹ : 2960, 1590, 1565, 1500 6,8-Dichloro-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₇ H₁₅ Cl₂ NO MM=320.218 ##STR97## [oil]IR in cm⁻¹ : 2960, 1585, 1545 ¹ H NMR (CDCl₃) in ppm: 8.47 (1H, m), 7.22 (5H, m), 6.50 (1H, s), 4.05 (2H, s), 1.10 (6H, s). 7,8-Dichloro-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₇ H₁₅ Cl₂ NO MM=320.218 ##STR98## [M.p.=98° C.; hexane; 81%]IR in cm⁻¹ : 2960, 1580, 1475 ¹ H NMR (CDCl₃) in ppm: 8.58 (1H, m) , 7.40 (5H, m) , 5.88 (1H, s), 3.90 (2H, s), 1.15 (6H, s). 7,9-Dichloro-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₇ H₁₅ Cl₂ NO MM=320.218 ##STR99## [M.p.=124° C.; heptane; 66%]IR in cm⁻¹ : 2970, 1585, 1470 ¹ H NMR (CDCl₃) in ppm: 8.59 (1H, m) , 7.45 (4H, m), 6.62 (1H, d, J=1.5 Hz), 5.95 (1H, s), 4.00 (2H, s), 1.21 (6H, s). 8,9 -Dichloro-3,3-dimethyl-5-(2 -pyridyl) -2,3 -dihydro-1-benzoxepine C₁₇ H₁₅ Cl₂ NO MM=320.218 ##STR100## [M.p.=112° C.; heptane; 55 %]IR in cm⁻¹ : 2970, 1580, 1475 ¹ H NMR (CDCl₃) in ppm: 8.62 (1H, m) , 7.67 (1H, m) , 7.15 (2H, m), 6.92 (1H, d, J=8 Hz), 6.57 (1H, d, J=8 Hz), 5.92 (1H, s), 4.02 (2H, s), 1.22 (6H, s). 7,8-Difluoro-3,3-dimehtyl-5-(2-pyridyl)-2,2-dihydro-1-benzoxepine C₁₇ H₁₅ F₂ NO MM=287.308 ##STR101## [M.p.=86° C.; crystallization from pentane; 86%]IR in cm⁻¹ : 3070, 2970, 1585, 1510 ¹ H NMR (CDCl₃) in ppm: 8.58 (1H, m) , 7.68 (1H, m), 6.85 (4H, m), 5.85 (1H, s), 3.93 (2H, s), 1.20 (6H, s). 8-Chloro-7-fluoro-3,3-dimethyl-5-(2-pyridyl) -2,3 -dihydro-1-benzoxepine C₁₇ H₁₅ ClFNO MM=303.763 ##STR102## [M.p.=86° C.; 94%]IR in cm⁻¹ : 2950, 1585, 1560, 1485 ¹ H NMR (CDCl₃) in ppm: 8.63 (1H, m) , 7.68 (1H, m) , 7.18 (3H, m), 6.55 (1H, d), 5.90 (1H, s), 3.92 (2H, s), 1.15 (6H, s). 9-Ethyl-7-fluoro-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₉ H₂₀ NFO MM=297.372 ##STR103## [chromatography with silica gel and dichloromethane; 95%]IR in cm⁻¹ : 2950, 1585 ¹ H NMR (CDCl₃) in ppm: 8.60 (1H, m), 7.64 (1H, m), 7.15 (2H, m), 6.70 (1H, dd, J=2 Hz, J=8 Hz), 6.30 (1H, dd, J=2 Hz, J=10 Hz.), 5.90 (1H, s), 3.90 (2H, s), 2.69 (2H, q), 1.20 (9H, m). 7,8 -Dimethoxy-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine C₁₉ H₂₁ NO₃ MM=311.380 ##STR104## [M.p.=86° C.; 57%]IR in cm⁻¹ : 2950, 1605, 1580, 1515 ¹ H NMR (CDCl₃) in ppm: 8.61 (1H, m) , 7.63 (1H, m) , 7.17 (2H, m), 6.59 (1H, s), 6.25 (1H, s) , 5.76 (1H, s) , 3.92 (2H, s), 3.56 (3H, s), 3.50 (3H, s), 1.16 (6H, s). 7-Cyano-3,3,8-trimethyl-5-(2-pyridyl) -2,3-dihydro-1-benzoxepine C₁₉ H₁₈ N₂ O MM=290.364 ##STR105## [chromatography with silica gel and dichloromethane; M.p.=171° C., toluene; 32%]IR in cm⁻¹ : 3060, 2970, 2220, 1610, 1585, 1560, 1495 ¹ H NMR (CDCl₃) in ppm: 8.59 (1H, m), 7.69 (1H, m), 7.19 (2H, m), 7.00 (1H, s), 6.90 (1H, s), 5.85 (1H, s), 3.95 (2H, s), 2.41 (3H, s), 1.19 (6H, s). 8-Cyano-3,3,7- trimethyl-5- (2-pyridyl) -2,3-dihydro-1-benzoxepine C₁₉ H₁₈ N₂ O MM=290.364 ##STR106## [M.p.=136° C.; hexane; 40%]IR in cm⁻¹ : 3070, 2980, 2230, 1590, 1500 ¹ H NMR (CDCl₃) in ppm: 8.56 (1H, m) , 7.66 (1H, m) , 7.17 (1H, s) , 7.14 (2H, m) , 6.62 (1H, s) , 5.96 (1H, s) , 3.90 (2H, s), 2.27 (3H, s), 1.18 (6H, s). 3,3-Dimethyl-5-(2-pyridyl)-2,3,7,8,9,10-hexahydro-1-naphth[2,3 -oxepine C₂₁ H₂₃ NO MM=305.419 ##STR107## [M.p.=75° C.; crystallization from hexane; 88%]IR in cm⁻¹ : 2930, 1610, 1580, 1560, 1500 ¹ H NMR (CDCl₃) in ppm: 8.56 (1H, m) , 7.60 (1H, m) , 7.17 (2H, m), 6.71 (1H, s), 6.40 (1H, s), 5.75 (1H, s), 3.90 (2H, s), 2.56 (4H, m), 1.70 (4H, m), 1.14 (6H, s). 8-Cyano-3,3 -dimethyl-1-(2-pyridyl) -4,5-dihydro-3H-benzo-[f]-cycloheptene C₁₉ H₁₈ N₂ MM=274.365 ##STR108## [chromatography with silica gel and ethyl acetate/hexane: 25/75 mixture; M.p.=120° C.; diisopropyl ether; 31%]IR in cm⁻¹ : 2960, 2915, 2230, 1585, 1560 ¹ H NMR (CDCl₃) in ppm: 8.55 (1H, m), 7.62 (1H, m), 7.20 (5H, m), 6.30 (1H, s), 2.80 (2H, m), 1.88 (2H, m), 0.95 (6H, m). 7-Bromo-3,3-dimethyl-5-(3-pyridyl)-2,3-dihydro-1-benzoxepine C₁₇ H₁₆ BrNO MM=330.224 ##STR109## [M.p.=116° C.; heptane; 73%]IR in cm⁻¹ : 2950, 1560, 1485, 1465 ¹ H NMR (CDCl₃) in ppm: 8.51 (2H, m) , 7.35 (3H, m) , 6.88 (2H, m), 5.74 (1H, s), 3.91 (2H, s), 1.17 (6H, s). 7-Cyano-3,3-dimethyl-5-(3-pyridyl)-2,3-dihydro-1-benzoxepine C₁₈ H₁₆ N₂ O MM=276.237 ##STR110## [chromatography with silica gel and cyclohexane/ chloroform/methanol mixture: 56/33/11; M.p.=150° C.; heptane; 38%]IR in cm⁻¹ : 3090, 2980, 2250, 1600, 1570, 1500 ¹ H NMR (CDCl₃) in ppm: 8.46 (2H, m) , 7.18 (5H, m) , 5.79 (1H, s), 3.95 (2H, s), 1.18 (6H, s). 7,8-Dichloro-3,3-dimethyl-5-(3-pyridyl)-2,3-dihydro-1-benzoxepine C₁₇ H₁₅ Cl₂ NO MM=320.218 ##STR111## [M.p.=112° C.; diisopropyl ether; 36%]IR in cm⁻¹ : 3020, 2970, 1590, 1565, 1540 ¹ H NMR (CDCl₃) in ppm: 8.54 (2H, m) , 7.35 (2H, m) , 7.10 (1H, s), 6.77 (1H, s), 5.72 (1H, s), 3.92 (2H, s), 1.17 (6H, s).

EXAMPLE NO. 7

7-Ethyl-3,3-dimethyl-5-(2-pyridyl)-2,3,4,5-tetrahydro-1-benzoxepine C₁₉ H₂₃ NO MM=281.386 ##STR112##

A solution of 7-ethyl-3,3-dimethyl-5-(2-pyridyl)-2,3-dihydro-1-benzoxepine (75 g, 0.26 mol) in 96% ethanol (95 ml) is placed in a 125 ml autoclave. Palladium containing 50% moisture is then added (0.3 g at 10% on charcoal).

The hydrogen is introduced under pressure: 180 bar.

The whole mixture is stirred for 4 hours at 80° C.

The suspension is filtered and concentrated under reduced pressure.

[yellow oil; 78%]IR in cm⁻¹ : 2960, 1590, 1570, 1495 ¹ H NMR (CDCl₃) in ppm: 8.63 (1H, m) , 7.30 (5H, m) , 6.19 (1H, s), 4.54 (1H, dd, J=2 Hz, J=9 Hz), 3.89 (1H, d, 12 Hz), 3.48 (1H, d, J=12 Hz), 2.42 (3H, m), 1.67 (1H, m), 1.20 (3H, s), 1.03 (3H, t), 0.85 (3H, s).

EXAMPLE NO. 8

3,3-Dimethyl-7-nitro-5-(4-nitro-2-pyridyl) -2,3-dihydro-1-benzoxepine C₁₇ H₁₅ N₃ O₅ MM=341.323 ##STR113##

A mixture of 3,3-dimethyl-5-(2-pyridyl)-1-benzoxepin-5-ol (5 g, 0.018 mol) and of a commercial concentrated sulfuric acid solution (32 ml) is cooled to 0° C. Sodium nitrate (1.8 g, 0.02 mol) is added in portions over 2 hours at 0° C. with stirring. The reaction mixture is then poured into ice-cold water (100 ml) and extracted with dichloromethane.

The organic phase is washed with water, dried over anhydrous sodium sulfate and concentrated under reduced pressure.

[1.4 g; M.p.=180° C.; ethyl acetate; 25%]IR in cm⁻¹ : 3100, 2970, 1545, 1530, 1480 ¹ H NMR (CDCl₃) in ppm: 8.56 (1H, m) , 8.34 (1H, d, J=2.50 Hz), 7.90 (1H, d, J=2.50 Hz), 7.48 (3H, m), 6.15. (1H, s), 4.15 (2H, s), 1.25 (6H, s).

By using the process described for Example 4, the following compounds are prepared.

7-Bromo-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro -1-benzoxepine C₁₇ H₁₆ BrNO₂ MM=346.223 ##STR114## [chromatography with silica gel and ethyl acetate; M.p.=158°-160° C.; ethyl acetate; 29%]IR in cm⁻¹ : 3040, 2960, 1480 ¹ H NMR (CDCl₃) in ppm: 8.25 (1H, m) , 6.98 (6H, m) , 5.82 (1H, s), 3.95 (2H, s), 1.19 (6H, s).

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    59.24    4.68   23.09  3.91     % Calculated                58.97    4.66   23.08  4.05 9.24     ______________________________________

7-Chloro-3,3-methyl-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₇ H₁₆ ClNO₂ MM=301.772 ##STR115## [M.p.=168°-170° C.; acetone; 15%]IR in cm⁻¹ : 2960, 1480 ¹ H NMR (CDCl₃) in ppm:8.25 (1H, m), 6.93 (6H, m), 5.84 (1H, s), 3.95 (2H, s), 1.19 (6H, s).

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    67.85    5.19   11.91  4.51     % Calculated                67.66    5.34   11.75  4.64 10.60     ______________________________________

7-Fluoro-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine C₁₇ H₁₆ PNO₂ MM=269.318 ##STR116## [M.p.=814°-185° C.; ethyl acetate; 28%]IR in cm⁻¹ : 3050, 2950, 1490 ¹ H NMR (CDCl₃) in ppm: 8.23 (1H, m) , 6.75 (6H, m) , 5.83 (1H, s), 3.96 (2H, s), 1.19 (6H, s).

    ______________________________________     Elemental analysis              C      H      F        N    O     ______________________________________     % Found    71.62    5.57   6.91   4.81     % Calculated                71.56    5.65   6.66   4.91 11.22     ______________________________________

3,3 -Dimethyl-5-(2-pyridyl N-oxide) -2,3 -dihydro-1-benzoxepine C₁₇ H₁₇ NO₂ MM=265.327 ##STR117## [M.p.=188°-189° C.; isopropanol; 19%]IR in cm⁻¹ : 3050, 3010, 2960, 2870, 1605, 1570, 1490 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m), 6.91 (7H, m), 5.80 (1H, s), 4.00 (2H, s), 1.21 (6H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      76.53  6.45       5.05     % Calculated 76.38  6.41       5.24 11.97     ______________________________________

3,3,3,7-Trimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₈ H₁₉ NO₂ MM=281.354 ##STR118## [M.p.=146°-147° C.; ethyl acetate]IR in cm⁻¹ : 3030, 2960, 2930, 2870, 1605, 1570, 1490 ¹ H NMR (CDCl₃) in ppm: 8.23 (1H, m) , 7.21 (3H, m) , 6.89 (2H, m), 6.34 (1H, m), 5.75 (1H, s), 3.95 (2H, s), 2.11 (3H, s), 2.11 (3H, s), 1.16 (6H, s)

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      77.04  6.75       5.07     % Calculated 76.84  6.81       4.98 11.37     ______________________________________

7-Ethyl-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₉ H₂₁ NO₂ MM=295.369 ##STR119## [M.p.=126°-129° C.; ethyl acetate/diisopropyl ether: 2/1; 20%]IR in cm⁻ : 3030, 2960, 2930, 2870, 1610, 1575, 1500 ¹ H NMR (CDCl₃) in ppm: 8.28 (1H, m), 7.23 (3H, m), 6.94 (2H, m), 6.38 (1H, m), 5.78 (1H, s), 3.96 (2H, s), 2.43 (2H, q), 1.18 (6H, s), 1.04 (3H, t).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      77.48  7.26       4.79     % Calculated 77.26  7.17       4.74 10.83     ______________________________________

7-Isopropyl-3,3-dimethyl -5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₂₀ H₂₃ NO₂ MM=309.407 ##STR120## M.p.=162°-164° C.; ethyl acetate]IR in cm⁻ : 3025, 2950, 1500 ¹ NMR (CDCl₃) in ppm: 8.26 (1H, m) , 7.08 (5H, m) , 6.38 (1H, s), 5.75 (1H, s), 3.95 (2H, s), 2.65 (1H, m), 1.10 (12H, m)

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      77.43  7.50       4.49     % Calculated 77.64  7.49       4.53 10.34     ______________________________________

3,3-Dimethyl-7-(1-methylpropyl)-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₂₃ H₂₅ NO₂ MM=323.434 ##STR121## [chromatography with silica gel and dichloromethane/methanol: 99/1; M.p.=110°-112° C.; cyclohexane]

IR in cm⁻¹ : 3030, 2950, 1605, 1500, 1480 ¹ H NMR (CDCl₃) in ppm: 8.28 (1H, m), 7.20 (3H, m), 6.91 (2H, m), 6.33 (1H, s), 5.77 (1H, s), 3.98 (2H, s), 2.32 (1H, m), 1.18 (6H, s), 1.05 (8H, m)

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      77.93  7.81       4.24     % Calculated 77.98  7.79       4.33 9.89     ______________________________________

7-Methoxy-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₈ H₁₉ NO₃ MM=297.353 ##STR122## [M.p.=164°-166° C.; ethyl acetate]IR in cm⁻¹ : 3050, 2960, 1615, 1580, 1510, 1495 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m) , 6.93 (5H, m) , 6.14 (1H, m), 5.79 (1H, s), 3.93 (2H, s), 3.56 (3H, s), 1.15 (6H, s)

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      73.00  6.49       4.71     % Calculated 72.70  6.44       4.71 16.14     ______________________________________

3,3-Dimethyl-5-(2-pyridyl N-oxide)-7-trifluoromethoxy-2,3 -dihydro- 1-benzoxepine C₁₈ H₁₆ F₃ NO₃ MM=351.325 ##STR123## [M.p.=157°-159° C.; ethyl acetate]IR in cm⁻¹ : 3070, 2970, 1495 ¹ H NMR (CDCl₃) in ppm: 8.24 (1H, m), 7.14 (5H, m), 6.39 (1H, s), 5.85 (1H, s), 3.96 (2H, s), 1.19 (6H, s).

    ______________________________________     Elemental analysis              C      H      F        N    O     ______________________________________     % Found    61.79    4.77   16.38  3.91     % Calculated                61.53    4.59   16.22  3.99 13.66     ______________________________________

3,3-Dimethyl-5-(2-pyridyl N-oxide)-7-trifluoromethyl-2,3-dihydro-1-benzoxepine C₁₅ H₁₆ F₃ NO₂ MM=335.325 ##STR124## [M.p.=152°-153° C.; ethyl acetate/hexane: 1/2]IR in cm⁻¹ : 3060, 2970, 1610, 1495 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m), 7.13 (6H, m), 5.89 (1H, s), 4.00 (2H, s), 1.18 (6H, s)

    ______________________________________     Elemental analysis              C      H      F        N    O     ______________________________________     % Found    64.55    4.76   17.55  4.10     % Calculated                64.47    4.81   17.00  4.18 9.54     ______________________________________

3,3-Dimethyl-7-methylsulfonyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₈ H₁₉ NO₄ S MM=345.418 ##STR125## [chromatography with silica gel and acetone; M.p.=200° C., diisopropyl ether]IR in cm⁻¹ : 2970, 1600, 1565, 1490 ¹ H NMR (CDCl₃) in ppm: 8.23 (1H, m) , 7.65 (1H, m) , 7.19 (5H, m), 5.97 (1H, s), 4.04 (2H, s), 2.91 (3H, s), 1.22 (6H, s)

    ______________________________________     Elemental analysis              C      H      N        O    S     ______________________________________     % Found    62.86    5.64   3.95   18.25                                            9.25     % Calculated                62.59    5.54   4.06   18.53                                            9.28     ______________________________________

3,3-Dimethyl-7-phenyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₂₃ H₂₁ NO₂ MM=343.424 ##STR126## [chromatography with silica gel and ethyl acetate/ chloroform/methanol mixture: 60/30/10; M.p.=165°-168° C.; IR in cm⁻¹ : 3050, 2960, 1605 ¹ H NMR (CDCl₃) in ppm: 8.24 (1H, m), 7.08 (11H, m), 5.82 (1H, s), 3.98 (2H, s), 1.16 (6H, s)

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      80.04  6.20       4.01     % Calculated 80.44  6.16       4.08 9.32     ______________________________________

8-Bromo-3,3-dimethyl-5-(2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine C₁₇ H₁₆ BrNO₃ MM=346.223 ##STR127## [chromatography on silica gel and dichloromethane/ methanol: 98/2; M.p.=135°-137° C.; diisopropyl ether/ethyl acetate: 60/40]IR in cm⁻¹ : 3080, 2970, 1590, 1550, 1480 ¹ H NMR (CDCl₃) in ppm: 8.21 (1H, m) , 7.09 (5H, m) , 6.40 (1H, d, J=8 Hz), 5.81 (1H, s), 3.95 (2H, s), 1.17 (6H, s)

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    59.23    4.70   22.94  3.97     % Calculated                58.97    4.66   23.08  4.05 9.24     ______________________________________

7-Cyano-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3 -dihydro-1-benzoxepine C₁₈ H₁₆ N₂ O₂ MM=292.337 ##STR128## [M.p.=206°-207° C.; ethyl acetate; 33%]IR in cm⁻¹ : 2985, 2220, 1595, 1560, 1490 ¹ H NMR (CF₃ COOD) in ppm: 8.79 (1H, m), 8.05 (4H, m), 7.25 (1H, d, J=8 Hz), 6.88 (1H, d, J=2 Hz), 6.22 (1H, s), 4.15 (2H, s), 1.30 (6H, s)

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      74.09  5.57       9.40     % Calculated 73.95  5.52       9.58 10.95     ______________________________________

8-Cyano-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₈ H₁₆ N₂ O₂ MM=292.337 ##STR129## [chromatography with silica gel and dichloromethane/ methanol: 98/2: M.p.=195°-197° C.; ethanol]IR in cm⁻¹ : 3090, 2970, 2230, 1550 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m), 7.18 (5H, m), 6.64 (1H, d, J=8 Hz), 5.95 (1H, s), 3.96 (2H, s), 1.20 (6H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      74.21  5.61       9.77     % Calculated 73.95  5.52       9.58 10.95     ______________________________________

3,3-Dimethyl-5-(2-pyridyl N-oxide)-8-trifluromethyl-2,3-dihydro-1-benzoxepine C₁₉ H₁₆ F₃ NO₂ MM=335.325 ##STR130## M.p.=130°-131° C.; hexane; 25%]IR in cm⁻¹ : 3060, 2960, 1570, 1485 ¹ H NMR (CDCl₃) in ppm: 8.25 (1H, m) , 7.03 (6H, s) , 5.95 (1H, s), 4.01 (2H, s), 1.19 (6H, s)

    ______________________________________     Elemental analysis              C      H      F        N    O     ______________________________________     % Found    64.74    4.93   17.00  4.18     % Calculated                64.47    4.81   17.00  4.18 9.54     ______________________________________

3,3-Dimethyl-5-(2-pyridyl N-oxide)-7-pentafluoroethyl-2,3-dihydro-1-benzoxepine C₁₉ H₁₆ F₅ NO₂ MM=385.333 ##STR131## [M.p.=161°-162° C.; ethyl acetate]IR in cm⁻¹ : 3070, 2970, 1610, 1585, 1600, 1590 ¹ H NMR (CDCl₃) in ppm: 8.25 (1H, m), 7.98 (6H, m), 5.93 (1H, s), 4.03 (2H, s), 1.20 (6H, s)

    ______________________________________     Elemental analysis              C      H      F        N    O     ______________________________________     % Found    59.52    4.31   24.27  3.62     % Calculated                59.22    4.19   24.65  3.64 8.30     ______________________________________

3,3,-Dimethyl-7-nitro-5-(4-nitro-2-pyridyl N-oxide)-2,3-dihydro -1-benzoxepine C₁₇ H₁₅ N₃ O₆ MM=357.322 ##STR132## [chromatography with silica gel and ethyl acetate/ chloroform/methanol: 60/30/10; M.p.=228° C., methanol]IR in cm⁻¹ : 3100, 2970, 1545, 1530, 1480 ¹ H NMR (CDCl₃) in ppm: 8.37 (1H, d, J=2.70 Hz), 8.25 (1H, m, J=2.50 Hz), 7.65 (1H, d, J=2.70 Hz), 7.38 (3H, m, J=2.50 Hz), 6.17 (1H, s), 4.21 (2H, s), 1.28 (6H, s)

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      57.35  4.25       11.49     % Calculated 57.14  4.23       11.76                                         26.86     ______________________________________

8-Cyano-3,3-dimethyl-1-(2-pyridyl N-oxide)-4,5-dihydro-3H-benzo [f]cycloheptane C₁₉ H₁₈ N₂ O MM=290.364 ##STR133## [chromatography with silica gel and cyclohexane/ chloroform/methanol mixture: 70/20/10; M.p. =189° C., toluene; 42%]IR in cm⁻¹ : 2950, 2225, 1595 ¹ H NMR (CDCl₃) in ppm: 8.08 (1H, m), 7.27 (5H, m), 6.85 (1H, s) 5.92 (1H, s), 2.93 (2H, m), 1.88 (2H, m), 0.95 (6H, m)

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      78.30  5.90       9.39     % Calculated 78.59  6.25       9.65 5.51     ______________________________________

6,8-Dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide)-3,3-dihydro-1-benzoxepine C₁₇ H₁₅ Cl₂ NO₂ MM=336.217 ##STR134## [M.p.=163°-164° C.; ethyl acetate]IR in cm⁻¹ : 3050, 2970, 1590, 1550 ¹ H NMR (CDCl₃) in ppm: 8.09 (1H, m), 7.47 (5H, m), 6.21 (1H, s), 4.00 (2H, s), 1.15 (6H, s)

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    60.75    4.70   21.26  4.12     % Calculated                60.73    4.50   21.09  4.17 9.52     ______________________________________

7,8-Dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₇ H₁₅ Cl₂ NO₂ MM=336.217 ##STR135## [M.p.=173°-174° C.; ethyl acetate; 37%]IR in cm⁻¹ : 3070, 2960, 1475 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m), 7.20 (4H, m), 6.60 (1H, s), 5.85 (1H, s), 3.95 (2H, s), 1.15 (6H, s)

    ______________________________________     Elemental analysis              C      N      Cl       N    O     ______________________________________     % Found    60.47    4.46   21.11  4.12     % Calculated                60.73    4.50   21.09  4.17 9.52     ______________________________________

7,9-Dichloro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₇ H₁₅ Cl₂ NO₂ MM=336.217 ##STR136## [M.p.=155°-157° C.; diisopropyl ether/ethyl acetate: 70/30; 30 %]IR in cm⁻¹ : 3035, 1470, 1419 ¹ H NMR (CDCl₃) in ppm: 8.22 (1H, m), 7.34 (4H, m), 6.42 (1H, d, J=2 Hz), 5.88 (1H, s), 4.02 (2H, s), 1.21 (6H, s)

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    60.83    4.55   20.82  4.16     % Calculated                60.73    4.50   21.09  4.17 9.52     ______________________________________

8,9 -Dichloro-3,3 -dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro -1-benzoxepine C₁₇ H₁₅ Cl₂ NO₂ MM=336.217 ##STR137## [M.p.=168° C.; ethyl acetate; 26%]IR in cm⁻¹ : 2960, 1470, 1422 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m) , 7.25 (3H, mR), 6.95 (1H, d, J=8 Hz), 6.42 (1H, d, J=8 Hz), 5.85 (1H, s), 4.07 (2H, s), 1.24 (6H, s)

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    61.14    4.71   21.21  4.07     % Calculated                60.73    4.50   21.09  4.17 9.52     ______________________________________

7,8-Difluoro-3,3 -dimethyl-5- (2-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine C₁₇ H₁₅ F₂ NO₂ MM=303.308 ##STR138## [M.p.=163°-165° C.; ethyl acetate]IR in cm⁻¹ : 3060, 2965, 1600, 1515 ¹ H NMR (CDCl₃) in ppm: 8.23 (1H, m) , 7.28 (3H, m) , 6.80 (1H, dd, J=7.0 Hz), 6.35 (1H, dd, J=8.0 Hz), 5.80 (1H, s), 3.95 (2H, s), 1.18 (6H, s)

    ______________________________________     Elemental analysis              C      H      F        N    O     ______________________________________     % Found    67.36    4.56   12.73  4.95     % Calculated                67.32    4.99   12.53  4.62 10.55     ______________________________________

8-Chloro-7-fluoro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₇ H₁₅ ClFNO₂ MM=319.762 ##STR139## [M.p.=149°-151° C.; ethyl acetate]IR in cm⁻¹ : 3050, 2970, 1485 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m) , 7.15 (4H, m) , 6.35 (1H, d), 5.85 (1H, s), 3.93 (2H, s), 1.14 (6H, s)

    ______________________________________     Elemental analysis             C    H        Cl     F      N    O     ______________________________________     % Found   64.04  4.82     11.16                                    5.91   4.41     % Calculated               63.85  4.73     11.09                                    5.94   4.38 10.01     ______________________________________

9-Ethyl-7-fluoro-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₉ H₂₀ NFO₂ MM=313.371 ##STR140## [chromatography with silica gel and acetone/ethyl acetate mixture: 50/50; M.p.=120°-2° C.; diisopropyl ether]IR in cm⁻¹ : 2960, 2940, 1610, 1590 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m) , 7.20 (3H, m) , 6.69 (1H, dd, J=2 Hz, J=8 Hz), 6.25 (1H, dd, J=2 Hz, J=10 Hz), 5.79 (1H, s), 3.94 (2H, s), 2.66 (2H, q) , 1.19 (6H, s), 1.16 (3H, t).

    ______________________________________     Elemental analysis              C      H      F        N    O     ______________________________________     % Found    73.12    6.54   6.18   4.58     % Calculated                72.82    6.43   6.06   4.47 10.21     ______________________________________

7,8-Dimethoxy-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dlhydro-1-benzoxepine C₁₅ H₂₁ NO₄ MM=327.379 ##STR141## [chromatography with silica gel and dichloromethane/ methanol: 98/2; M.p.=146° C.; ethyl acetate]IR in cm⁻¹ : 3110, 2950, 1615, 1520, 1490 ¹ H NMR (CDCl₃) in ppm: 8.26 (1H, m), 7.25 (3H, m), 6.57 (1H, s), 6.08 (1H, s), 5.70 (1H, s), 3.99 (2H, s), 3.81 (3H, s), 3.56 (3H, s), 1.19 (6H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      69.86  6.70       4.12     % Calculated 69.70  6.47       4.28 19.55     ______________________________________

7-Cyano-3,3,8-trimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro -1-benzoxepine C₁₉ H₁₈ N₂ O₂ MM=306.363 ##STR142## [chromatography with silica gel and chloroform/methanol mixture: 98/2; M.p.=230°-235° C.; toluene/diisopropyl ether]IR in cm⁻¹ : 3060, 2950, 2210, 1605, 1495

    ______________________________________     Elemental analysis                C    N          N      O     ______________________________________     % Found      74.39  6.00       8.93     % Calculated 74.49  5.92       9.15 10.45     ______________________________________

[Cyano-3,3,7-trimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₉ H₁₈ N₂ O₂ MM=306.363 ##STR143## [M.p.=182° C.; toluene; 30%]IR in cm⁻¹ : 3070, 2960, 2225, 1605, 1545, 1490 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m) , 7.22 (4H, m) , 6.44 (1H, s), 5.90 (1H, s), 3.92 (2H, s), 2.26 (3H, s), 1.18 (6H, s)

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      74.70  5.91       9.04     % Calculated 74.49  5.92       9.15 10.45     ______________________________________

3,3-Dimethyl-5- (2-pyridyl N-oxide) -2,3,7,8,9,10-hexahydro-1-naphth [2,3-b)oxepine C₂₁ H₂₃ NO₂ MM=321.418 ##STR144## [chromatography with silica gel and dichloromethane/ methanol: 98/2; M.p.=184° C.; toluene]IR in cm⁻¹ : 2930, 1610, 1550, 1500 ¹ H NMR (CDCl₃) in ppm: 8.22 (1H, m) , 7.22 (3H, m) , 6.72 (1H, s), 6.24 (1H, s), 5.69 (1H, s), 3.95 (2H, s), 2.58 (4H, m), 1.70 (4H, m), 1.16 (6H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      78.30  7.39       4.48     % Calculated 78.47  7.21       4.36 9.96     ______________________________________

7-Ethyl -3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3,4,5-tetra-hydro-1-benzoxepine C₁₉ H₂₃ NO₂ MM=297.385 ##STR145## [m.p.=88°-89° C.; diisopropyl ether]IR in cm⁻¹ : 3060, 3020, 2960, 2930, 2870, 1610, 1490 ¹ NMR (CDCl₃) in ppm: 8.28 (1H, m) , 7.16 (3H, m) , 6.96 (2H, m), 6.45 (1H, m), 5.20 (1H, dd, J=2 Hz, J=9 Hz), 3.71 (2H, s), 2.50 (3H, m), 1.70 (1H, dd, J=2 Hz, J=13.5 Hz), 1.07 (3H, s), 1.06 (3H, t), 0.80 (3H, s)

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      76.63  7.75       4.62     % Calculated 76.73  7.80       4.71 10.76     ______________________________________

7-Bromo-3,3-dimethyl-5-(3-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₇ H₁₆ BrNO₂ MM=346.223 ##STR146## M.p.=161°-162° C.; ethyl acetate; 50%]IR in cm⁻¹ : 3090, 2950, 1580, 1540, 1460 ¹ H NMR (CDCl₃) in ppm: 8.19 (2H, m), 7.23 (3H, m), 6.90 (2H, m), 5.77 (1H, s), 3.90 (2H, s), 1.17 (6H, s)

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    59.07    4.72   22.99  4.13     % Calculated                58.97    4.66   23.06  4.05 9.26     ______________________________________

7-Cyano-3,3-dimethyl-5-(3-pyridyl N-oxide) -2,3-dihydro-1-benzoxepine C₁₈ H₁₆ N₂ O₂ MM=292.337 ##STR147## M.p.=162°-164° C.; ethyl acetate; 45%]IR in cm⁻¹ : 3070, 2960, 2230, 1600 ¹ H ,NMR (CDCl₃) in ppm: 8.17 (2H, m), 7.25 (5H, m), 5.85 (1H, s), 3.92 (2H, s), 1.15 (6H, s)

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      73.89  5.52       9.68     % Calculated 73.95  5.52       9.58 10.95     ______________________________________

7,8-Dichloro-3,3-dimethyl-5-(3-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₇ H₁₅ Cl₂ NO₂ MM=336.217 ##STR148## [137°-139° C.; isooctane and diisopropyl ether: 50/50; 46%]IR in cm⁻¹ : 3120, 3030, 2950, 1590, 1540 ¹ H NMR (CDCl₃) in ppm: 8.20 (2H, m), 7.16 (3H, m), 6.80 (1H, s), 5.79 (1H, s), 3.90 (2H, s), 1.19 (6H, s)

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    66.70    4.54   21.24  4.05     % Calculated                60.73    4.50   21.09  4.17 9.52     ______________________________________

3,3-Dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine-7-carboxamide C₁₈ H₁₈ N₂ O₃ MM=310.352 ##STR149## [M.p.=215°-217° C.; methanol; 28%]IR in cm⁻¹ : 3400, 3200, 2970, 1665, 1605 ¹ H NMR (DMSO) in ppm: 8.16 (1H, m) , 7.35 (6H, m) , 5.85 (1H, s), 3.93 (2H, s), 1.13 (6H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      69.49  5.84       8.80     % Calculated 69.66  5.85       9.03 15.47     ______________________________________

3,3 -Dimethyl-7-phenylsulfonyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₂₃ H₂₁ NO₄ S MM=407.490 ##STR150## [M.p.=167°-169° C.; diisopropyl ether; 19%]IR in cm⁻¹ : 3060, 2950, 1600, 1560, 1490 ¹ H NMR (CDCl₃) in ppm: 8.20 (1H, m) , 7.38 (11H, m) , 5.93 (1H, s), 3.99 (2H, s), 1.19 (6H, s)

    ______________________________________     Elemental analysis              C      H      N        O    S     ______________________________________     % Found    67.84    5.34   3.42   15.57                                            7.83     % Calculated                67.79    5.20   3.44   15.71                                            7.87     ______________________________________

7-Chloro-8-ethyl-3,3-dimethyl-5-(2-pyridyl N-oxide)-2,3-dihydro-1-benzoxepine C₁₉ H₂₀ ClNO₂ MM=329.829 ##STR151## [M.p.=144°-146° C.; ethyl acetate; 34%]IR in cm⁻¹ : 3070, 2950, 1485 ¹ H NMR (CDCl₃) in ppm: 8:23 (1H, m), 7.20 (3H, m), 6.87 (1H, s), 6.50 (1H, s), 5.78 (1H, s), 3.95 (2H, s), 2.62 (2H, q), 1.18 (3H, t), 1.15 (6H, s)

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    69.25    6.01   10.89  4.26     % Calculated                69.19    6.11   10.75  4.25 9.70     ______________________________________

8-Bromo-3,3 -dimethyl -1-(2-pyridyl N-oxide)-3H-benzo [f]-cyclohepta-1,4-diene C₁₈ H₁₆ BrNO MM=342.235 ##STR152## [M.p.=167° C.; diisopropyl ether; 10%]IR in cm⁻¹ : 3080, 2980, 1485 ¹ H NMR (CDCl₃) in ppm: 8.11 (1H, m), 7.15 (6H, m), 6.52 (1H,d,J=10 Hz), 5.88 (1H, s), 5.75 (1H, d, J=10 Hz), 1.11 (6H, s).

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    63.16    4.56   23.05  4.09     % Calculated                63.17    4.71   23.35  4.09 4.68     ______________________________________

3,3-Dimethyl-7-(2-methylpropyl)-5-(2-pyridyl-N-oxide)-2,3-dihydro-1-benzoxepine C₂₁ H₂₅ NO₂ MM=323.434 ##STR153## [M.p.=114°-116° C.; diisopropyl ether;, 25%]IR in cm⁻¹ : 3060; 2960; 1500; 1490 ¹ NMR (CDCl₃) in ppm:8.20(1H, m); 7.20(3H, m); 6.86(2H, m); 6.30(1H, s); 5.76(1H, s); 3.95(2H, s); 2.22(2H, d); 1.68(1H, m); 1.16(6H, s); 0.8(3H, s); 0.58(3H, s).

    ______________________________________     Elemental analysis                C    H          N      O     ______________________________________     % Found      77,92  7,55       4,42     % Calculated 77,98  7,79       4,33 9,89     ______________________________________

7-Chloro-3,3,8-trimethyl-5-(2-pyridyl-N -oxide)-2,3-dihydro-1-benzoxepine C₁₈ H₁₈ CINO₂ MM=315,803 ##STR154## [M.p.=178°-180° C.; ethyl acetate 20%]IR in cm⁻¹ : 3060; 2960; 1610; 1490 ¹ H NMR (CDCl₃) in ppm: 8.19(1H, m); 7.20(3H, m); 6.85(1H, s); 6.49(1H,s); (1H, s); 5.75(1H, s); 3.92(2H, s); 2.22(3H, s): 1.15(6H, s).

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    68,74    5,73   11,48  4,42     % Calculated                68,48    5,75   11,23  4,44 10,13     ______________________________________

7-Bromo-8-chloro-3,3-dimethyi-5-(2-pyridyl-N-oxyde)-2,3-dihydro-1-benzoxepine C₁₇ H₁₅ BrCINO₂ MM=380,672 ##STR155## [M.p.=182°-183° C.; ethyl acetate; 44%]IR in cm⁻¹ : 3060; 2950; 1580; 1540; 1470 ¹ NMR (CDCl₃) in ppm: 8.22(1H, m); 7.22(3H, m); 7.08(1H, s); 6.72(1H, s); 5.83(1H, s); 3.95(2H, s); 1.17(6H, s).

    ______________________________________     Elemental analysis             C    H        Br     Cl     N    O     ______________________________________     % Found   53,72  3,87     20,89                                    9,46   3,75     % Calculated               53,63  3,97     20,99                                    9,31   3,68 8,41     ______________________________________

8-Chloro-7-cyano-3,3-dimethyl-5-(2-pyridyl-N-oxide)-2,3-dihydro-1-benzoxepine C₁₈ H₁₅ CIN₂ O₂ MM=326,786 ##STR156## [M.p.=206°-207° C.; ethyl acetate; 53%]IR in cm⁻¹ : 3080; 2990; 2240; 1600; 1550; 1490 ¹ (CDCl₃) in ppm: 8.20(1H, m); 7.23(3H, m); 7.13 (1H, s): 6.83(1H, s); 5.93(1H, s); 4.02(2H, s); 1.20(6, s),

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    65,51    4,56   10,89  8,48     % Calculated                66,16    4,63   10,85  8,57 9,79     ______________________________________

8-Chloro-3,3-dimethyl-5-(2-pyridyl-N-oxide)-7-trifluoromethyl-2,3-dihydro-1-benzoxepine C₁₈ H₁₅ CIF₃ NO₂ MM=369,774 ##STR157## [M.p.=158°-161° C.]IR in cm⁻¹ : 3080; 2980; 1610; 1565; 1495 ¹ NMR (CDCl₃) in ppm: 8.18(1H, m); 7.58(4H, m); 6.80(1H, s); 5.88(1H, s); 3.98(2H, s); 1.15(6H, s).

    ______________________________________     Elemental analysis             C    H        Cl     F      N    O     ______________________________________     % Found   58,42  4,24     9,99 14,79  3,83     % Calculated               58,46  4,09     9,59 15,42  3,79 8,65     ______________________________________

8-Bromo-3,3-dimethyl-1-(2-pyridyl-N-oxide)4,5-dihydro-3H-benzo[f]-cyclohept-1-ene C₁₈ H₁₈ BrNO MM=344,250 ##STR158## [M.p.=173°-175° C.; toluene; 43%]IR in cm⁻¹ : 3070; 2960; 1590; 1490 ¹ H NMR (CDCl₃) in ppm: 8.11(1H, m); 7.18(5H, m); 6.73(1H, d); 5.90(1H, s); 2.59(2H, m); 1.85(2H, m); 1.09(6H, s).

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    62,80    5,25   23,26  3,93     % Calculated                62,80    5,27   23,21  4,07 4,65     ______________________________________

3,3-Dimethyl-8-phenylsulfonyl-1-(2-pyridyl-N-oxide)-4,5-dihydro-3H-benzo[f]cyclohept-1-ene C₂₄ H₂₃ NO₃ S MM=405,517 ##STR159## [M.p.=191°-192° C.; isopropanol; 45%]IR in cm⁻¹ : 3060; 2950; 1595; 1585; 1560; 1485 ¹ H NMR (CDCl₃) in ppm: 8.08(1H, m); 7.45(11H. m); 5.95(1H, s); 2.92(2H, m); 1.88(2H, m); 1.10(6H, s).

    ______________________________________     Elemental analysis              C      H      N        O    S     ______________________________________     % Found    70,86    5,82   3,34        7,83     % Calculated                71,08    5,72   3,45   11,84                                            7,91     ______________________________________

7,8-Dichloro-3,3-dimethyl-1-(2-pyridyl-N-oxide)-4,5-dihydro-3H-benzo[f]cyclohept- 1-ene C₁₈ H₁₇ Cl₂ NO MM=334,252 ##STR160## [M.p.=195°-196° C.; toluene; 25%]IR in cm⁻¹ : 3070; 2970; 1550; 1480 ¹ H NMR (CDCl₃) in ppm: 8.12(1H, m); 7.25(4H, m); 6.68(1H, s); 5.92(1H, s); 2.61(2H, m); 1.85(2H, m); 1.11(6H, s).

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    64,32    5,17   21,10  4,31     % Calculated                64,38    5,13   21,22  4,19 4,79     ______________________________________

8-Bromo-4,4-dimethyl-1-(2-pyridyl-N-oxide)-3,4-dihydro-3H-benzo[f]cyclohept-1-ene C₁₈ H₁₈ BrNO MM=334.250 ##STR161## [M.p.=137°-139° C.; diisopropyl ether, 20%]IR in cm⁻¹ : 2960; 2930; 1610; 1590; 1550; 1490 ¹ H NMR (CDCl₃) in ppm: 8.12(1H, m); 7.12(6H, m); 6.51(1H, d); 2.58(2H, s); 1.74(2H, d); 1.05(6H, s).

    ______________________________________     Elemental analysis              C      H      Br       N    O     ______________________________________     % Found    62,80    5,14   23,27  4,04     % Calculated                62,80    5,27   23,21  4,07 4,65     ______________________________________

Hemisulfate of 7-fluoro-3,3-dimethyl-5(2-pyridyl-N-oxide)-2,3-dihydro-1-benzoxepine C₁₇ H₁₇ FNO₄ S₀,5 MM=334,357 ##STR162## [M.p.=198°-199° C.; ethanol; 33%]IR in cm⁻¹ : 3090; 2970; 1620; 1580; 1500 ¹ NMR (CDCl₃) in ppm: 10.28(1H, s); 8.36(1H, m); 7.55(3H, m); 6.99(2H, m); 6.07(2H, m); 3.90(2H, s); 1.14(6H, s).

    ______________________________________     Elemental analysis            C     H       F       N     O     S     ______________________________________     % Found  61,06   5,45    5,46  4,19        5,01     % Calculated              61,07   5,12    5,68  4,19  19,14 4,80     ______________________________________

Hydrochloride of 7,8-dichloro-3,3-dimethyl-5-(2-pyridyl-N-oxide)-2,3-dihydro-1-benzoxepine C₁₇ H₁₆ Cl₃ NO₂ MM=372,690 ##STR163## [M.p.=182°-186° C.; acetone; 60%]IR in cm⁻¹ : 3090; 2970; 2270; 1700; 1605; 1525 ¹ NMR (CDCl₃) in ppm: 11.78(1H, s); 8.43(1H, m); 7.63(3H, m); 7.26(1H, s); 6.55(1H, s); 6.00(1H, s); 3.95(2H, s); 1.15(6H, s).

    ______________________________________     Elemental analysis              C      H      Cl       N    O     ______________________________________     % Found    54,74    4,24   27,89  3,90     % Calculated                54,78    4,33   28,54  3,76 8,59     ______________________________________

EXAMPLE 9

4-(4-Fluorophenoxy)-3.3-dimethyl-butanoic acid C₁₂ H₁₅ FO₃ MM=226.247 ##STR164## A suspension of 4-fluorophenol(21.3 g; 0.19 mol) and sodium hydroxide (7.6 g; 0.19 mol) in n-butanol under a flow of dry nitrogene is heated by an oil bath at 190° C. during 10 minutes. The reactor is equipped with a distillation system for the elimination of the formed water by azeotropic removal. The heating is continued to distill all of the n-butanol. Then the 3.3-dimethylbutyrolacetone (22.8 g; 0.20 mol) is added. The reaction medium is heated 10 hours at 160° C. (temperature inside the medium), then cooled to 80° C. for the addition of water (65 ml). The obtained solution is washed with dichloromethane and decanted. The aqueous phase is acidified and the desired acid is extracted with dichloromethane dried over anhydrous sodium sulfate. The solution is concentrated under reduced pressure and the oily residue is distilled.

[B.p.(53.2 Pa =0.4 mm Hg)=130°-134° C.; 75%]

IR in cm⁻¹ : 3480; 2200; 1705; 1600; 1505 ¹ H NMR (CDCl₃) in ppm: 10.75 (1H, m); 6.82 (4H, m); 3.66 (2H, S); 2.40 (2H, S); 1.11 (6H, S). 

We claim:
 1. A Compound of formula I: ##STR165## in which: X represents CHR, R being a hydrogen atom,R₁, R₂, R₃ and R₄, which are identical or different, represent a hydrogen atom or a C₁ -C₇ alkyl group; R₅ represents a hydrogen atom, a hydroxyl group or R₅, taken together with R₇, forms a bond; R₆ represents a pyridyl group or its n-oxide optionally substituted on the carbon atoms by 1 to 7 groups chosen from hydroxyl, nitro, cyano, C₁ -C₇ alkyl or C₁ -C₇ alkoxy; R₇ represents a hydrogen atom or a hydroxyl, C₁ -C₇ alkoxy or C₁ -C₇ acyloxy group or R₅ and R₇ together form a bond; R₈ and R₉, which are identical or different, represent a hydrogen or halogen atom, a hydroxyl, nitro, cyano, trifluoromethyl, trifiuoromethoxy, pentafluoroethyl, C₁ -C₇ alkyl, C₁ -C₇ alkoxy, C₁ -C₇ alkylthio, C₁ -C₇ acylthio, C₁ -C₇ alkylsulfonyl or C₁ -C₇ alkylsulfinyl group, a group of formulae: ##STR166## in which R₁₂ and R₁₃, which are identical or different, represent a hydrogen atom or a C₁ -C₇ alkyl group, or R₈ and R₉ represent a C₆ -C₁₀ aryl, (C₆ -C₁₀) -arylsulfonyl or (C₆ -C₁₀) arylsulfinyl group, optionally substituted by one to six substituents chosen from halo, hydroxyl, nitro, cyano, carboxyl, carbamoyl, trifluoromethyl, trifluoromethoxy, pentafluoroethyl, C₁ -C₇ alkyl, C₁ -C₇ alkoxy, C₁ -C₇ alkylthio, C₁ -C₇ acylthio, C₁ -C₇ alkylsulfonyl or C₁ -C₇ alkylsulfinyl, and N-oxides and pharmaceutically acceptable salts thereof.
 2. A compound of formula I according to claim 1, wherein R₁ and R₂ represent a hydrogen atom.
 3. A compound of formula I according to claim 1, wherein R₅ represents a hydrogen atom.
 4. A compound of formula I according to claim 1, wherein R₆ is chosen from 2-pyridyl, 2-pyridyl N-oxide, 3-pyridyl, 3-pyridyl N-oxide, 4-pyridyl, 3-hydroxy-4-pyridyl, 2 optionally substituted on the carbon atoms by 1 to 3 substituents chosen from hydroxyl, nitro, cyano, C₁ -C₇ alkyl and C₁ -C₇ alkoxy.
 5. A compound of formula I according to claim 1, wherein, R₇ represents a hydrogen atom or a hydroxyl, methoxy or acetoxy group.
 6. A compound according to claim 1 of the formula: ##STR167## in which X represents CHR, and R, R₅, R₆, R₇, R₈ and R₉ are as defined in claim
 1. 7. A compound according to claim 1 of the formula: ##STR168## in which X represents CHR, and R, R₆, R₈ and R₉ are as defined in claim
 1. 8. The compound 8-cyano-3,3-dimethyl-1-(2-pyridyl N-oxide)-4,5-dihydro -3H-benzocycloheptane.
 9. Pharmaceutical composition comprising, as active ingredient, an effective amount of a compound according to claim 1 and a pharmaceutically acceptable carrier. 